Last Updated：2025/11/19

(number theory) A number that is greater than the sum of all of its divisors except itself.

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deficient number

Source Word

deficient number

(number theory) A number that is greater than the sum of all of its divisors except itself.

Japanese Meaning

欠損数：その数自身を除くすべての約数の和が、その数より小さい自然数

16が不足数であることを示すには、真の約数の和を計算して、その和が16より小さいことを確かめます。

Sense（1）

(number theory) A number that is greater than the sum of all of its divisors except itself.

The factors of 22 are 1, 2 and 11 and 22, and 1 + 2 + 11 = 14, which is less than 22, so 22 is a deficient number.

deficient numbers

（ plural ）