A perfect number is:

When the sum of all the factors of a number is equal to twice the number.

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When the sum of all the factors of a number is equal to half the number.

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When the sum of all the factors of a number is equal to thrice the number.

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When the sum of all the factors of a number is equal to one more than half the number.

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Solution

The correct option is A
When the sum of all the factors of a number is equal to twice the number.

When the sum of all the factors of a number is equal to twice the number, it is called a perfect number.

For example, 6 is a perfect number since the sum of its factors 1, 2, 3 and 6 is 12, i.e., twice 6.

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Similar questions

A perfect number is a number for which the sum of all its factors is equal to twice the number.

A number for which sum of all its factors is equal to twice the number is called a ________.

In the answer of Question Number 139 it is written -

By definition, a number, for which the sum of all its factors excluding the number itself is equal to twice the number, is called perfect number.

Should it be as below -

a number, for which the sum of all its factors excluding the number itself is equal to the number, is called perfect number.

A number for which sum all its factors is equal to twice number is called ?

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