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What is the Definition of Perfect Numbers?
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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 :

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

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Perfect Number : 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 = 2×6 and 1 + 2 + 4 + 7 + 14 + 28 = 2× 28.

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