A perfect number is a number for which the sum of all its factors is equal to twice the number.
whose sum of all its factors is equal to twice the number.
A perfect number is a number for which the sum of all its factors is equal to twice the number.
For example, 6 is a perfect number since the sum of its factors 1, 2, 3 and 6 is 12 i.e. twice of 6.