In Jiangsu Nantong, if the social security base is 20,900, the amount received mainly depends on aspects such as pension calculation. Here's a breakdown:

1. Pension calculation:

• Basic pension: The formula is ​
  (Average monthly wage of on - the - job employees in the province in the previous year+My indexed average monthly contribution wage)÷×Contribution years×1%
  . Assuming the average monthly wage of on - the - job employees in the province is ​
  A
  and the contribution years is ​
  n
  . My indexed average monthly contribution wage is ​ (when the contribution base is 20900). If we assume ​
  A=
  (for example) and ​
  n=
  years. First, calculate the sum in the formula ​
  (+)÷=
  , then the basic pension is ​
  ××1%=
  yuan. But in fact, the average wage of on - the - job employees in the province changes every year, and the contribution years of each person are different.

• Personal account pension: The formula is ​
  Personal account savings amount÷Calculation and payment months
  . The personal account savings amount is accumulated from the personal part of the social security contributions over the years. The proportion of personal contributions to the pension insurance is generally ​
  8%
  . Assuming the contribution period is ​
  m
  years, the personal account savings amount ​
  =×8%××m
  . For example, if ​
  m=
  years, the personal account savings amount ​
  =×0.08××=
  yuan. If retiring at 60 years old, the calculation and payment months are 139, then the personal account pension ​
  =÷≈4268.2
  yuan.

2. Other social security benefits:

• Medical insurance: When seeing a doctor, with a high social security base, the reimbursement amount within the scope of medical insurance regulations may be relatively high. For example, in some cases of hospitalization, the reimbursement ratio for part of the expenses may be related to the contribution base, which can reduce personal medical expenses.

• Unemployment insurance: The amount of unemployment insurance benefits is related to factors such as the length of contribution. Although the social security base is 20900, the calculation of unemployment insurance benefits also needs to refer to local regulations on the calculation method of unemployment insurance benefits, generally a certain percentage of the local minimum wage, and is also affected by the contribution period.

• Work - related injury insurance: When a work - related injury occurs, the compensation amount is calculated according to relevant regulations. A high social security base may lead to higher compensation amounts in some items related to salary, such as work - related injury medical expenses, disability allowances, etc. But the specific amount needs to be determined according to the degree of work - related injury and relevant local policies.

• Maternity insurance: For female employees, maternity insurance benefits include maternity leave pay and medical expenses during childbirth. Maternity leave pay is generally calculated based on the average monthly wage of the unit in the previous year or the personal contribution base. With a social security base of 20900, if the maternity leave pay is calculated based on this base, the amount of maternity leave pay will be relatively high.

In general, if the social security base in Nantong, Jiangsu is 20900, the amount of various social security benefits received is affected by many factors. For pension, it is closely related to factors such as the average wage of on - the - job employees in the province, contribution years, and retirement age. For other social insurance types, they are also affected by relevant local policies and specific circumstances. It is recommended to consult the local social security department for accurate calculation and detailed information.