Question

) A given number is a .......... if the sum of all its factors equals twice the number. *

Answer 1

Answer:

A number for which sum of all its factors is equal to twice the is called a perfect no ... For example, the divisors of 28 are 1, 2, 4, 7, 14, and 28, so the sum of proper divisors is 1 + 2 + 4 + 7 + 14 = 28.