Question

What are Perfect Numbers?

Answer 1

Perfect Numbers : The sum of all factors of those numbers which is two times the given number are called perfect numbers. 

Example : 6 and 28 are perfect numbers because $1+2+3+6=2 \times 6$ and $1+2+4+7+14+28$ $=2 \times 28$

Answer 2

Perfect Number : If the sum of all the factors of a number is equal to twice the number, then the number is called a perfect number.

Examples :

• 6 ; Factors of 6 are 1,2,3,6 and (1+2+3+6) = 12
• 8 ; Factors of 28 are 1,2,4,7,14,28 and (1+2+4+7+14+28) = 56