Is 18 a deficient number and what is its deficiency?

Is 18 a deficient number?

Here we will explain and calculate if 18 is a deficient number and its deficiency if applicable.

18 is a deficient number if the sum of its proper divisors is less than 18.

The sum of its proper divisors is calculated as follows: 1 + 2 + 3 + 6 + 9 = 21.

21 is not less than 18. Therefore, 18 is not a deficient number.

The deficiency of 18 is 18 minus the sum of its proper divisors. Thus, the deficiency of 18 is 18 - 21 = No Deficiency

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