Is 21 an abundant number and what is its abundance?

Is 21 an abundant number?

Here we will explain and calculate if 21 is an abundant number and its abundance if applicable.

21 is an abundant number if the sum of its proper divisors is greater than 21.

The sum of its proper divisors is calculated as follows: 1 + 3 + 7 = 11.

11 is not greater than 21. Therefore, 21 is not an abundant number.

The abundance of 21 is the sum of its proper divisors minus 21. Thus, the abundance of 21 is 11 - 21 = no abundance

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