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Question

A perfect number is:


A

whose sum of all its factors is equal to twice the number.

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B

27

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C

whose sum of all its factors is equal to thrice the number.

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D

none of these

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Solution

The correct option is A

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.

Perfect numbers are also defined as those numbers that equal the sum of all their factors including 1 but excluding the number itself.

Taking the same example of 6: sum of its factors excluding the number itself i.e 6 = 1+2+3 = 6.


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