21216460

素因数分解:

$2^2\times 5^1\times {\mathrm{83}}^1\times {\mathrm{12781}}^1$

素因数の和:12873

約数の個数: 24

約数和(自身を含む): 45094896

約数和(自身を除く): 23878436

約数列:

[1, 2, 4, 5, 10, 20, 83, 166, 332, 415, 830, 1660, 12781, 25562, 51124, 63905, 127810, 255620, 1060823, 2121646, 4243292, 5304115, 10608230, 21216460]

約数ペア:

[(1, 21216460), (2, 10608230), (4, 5304115), (5, 4243292), (10, 2121646), (20, 1060823), (83, 255620), (166, 127810), (332, 63905), (415, 51124), (830, 25562), (1660, 12781)]