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Deficient number

3:32

Abundant, Deficient, and Perfect Numbers

2:35

Abundant and Deficient Numbers

0:34

Deficient number Meaning

2:50

Number Names: Abundant, Deficient, Perfect!

3:56

Deficient Number

In number theory, a deficient or deficient number is a number n for which the sum of divisors σ(n)<2n, or, equivalently, the sum of proper divisors s(n)<n. The value 2n − σ(n) is called the number's deficiency.
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