---
tag: 0MXGYCH4SY
kind: concept
name: Perfect number
msc: [11A25]
sources:
  - url: https://en.wikipedia.org/wiki/Perfect_number
    locator: lead section
same_as:
  wikidata: Q170043
  wikipedia: Perfect number
---

## Summary

A perfect number is a positive integer that is equal to the sum of its positive divisors other than itself.
The [[definition of a perfect number|0SB7Q8SYSF]] gives the precise form.