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

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Solution

A number for which sum all its factors is equal to twice number is called a perfect number.
For example:
Factors of $28$ are $1, 2, 4, 7, 14, 28$
Sum of the factors $= 56 = 2 \times 28$

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Similar questions

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.

Question 139

Fill in the blank to make the statement true.

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

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

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