Excessive number - Kajousu
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When the sum of the divisors (including 1) other than a for a natural number is greater than a , a is called an abundant number. For example, the divisors of 12 are 1, 2, 3, 4, and 6, and the sum of these is 1 + 2 + 3 + 4 + 6 = 16, which is greater than 12, so 12 is an abundant number. → Perfect number → Deficient number → Affluent number Source: About Shogakukan Digital Daijisen Information | Legend |
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自然数aで、a以外の約数（1を含む）の和がaより大きいとき、aを過剰数という。例えば、12の約数は、「1」「2」「3」「4」「6」の五つで、その合計が1＋2＋3＋4＋6＝16 となって12より大きいことから、12は過剰数となる。→完全数 →不足数 →友愛数
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