Is 820 a deficient number and what is its deficiency?

Is 820 a deficient number?

Here we will explain and calculate if 820 is a deficient number and its deficiency if applicable.

820 is a deficient number if the sum of its proper divisors is less than 820.

The sum of its proper divisors is calculated as follows: 1 + 2 + 4 + 5 + 10 + 20 + 41 + 82 + 164 + 205 + 410 = 944.

944 is not less than 820. Therefore, 820 is not a deficient number.

The deficiency of 820 is 820 minus the sum of its proper divisors. Thus, the deficiency of 820 is 820 - 944 = No Deficiency

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