perfect number

Noun

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

Japanese Meaning

完全数：自分自身を除く約数の総和がその数と等しい自然数

Every perfect number equals the sum of its proper divisors, and 28 is one of the smallest examples.

すべての完全数は自分自身を除く約数の和に等しく、28はその最小の例の一つです。

Sense（1）

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

The factors of 6 are 1, 2, 3 and 6, and 1 + 2 + 3 = 6, so 6 is a perfect number.

perfect numbers

（ plural ）