21781640

素因数分解:

$2^3\times 5^1\times {\mathrm{191}}^1\times {\mathrm{2851}}^1$

素因数の和:3053

約数の個数: 32

約数和(自身を含む): 49282560

約数和(自身を除く): 27500920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 191, 382, 764, 955, 1528, 1910, 2851, 3820, 5702, 7640, 11404, 14255, 22808, 28510, 57020, 114040, 544541, 1089082, 2178164, 2722705, 4356328, 5445410, 10890820, 21781640]

約数ペア:

[(1, 21781640), (2, 10890820), (4, 5445410), (5, 4356328), (8, 2722705), (10, 2178164), (20, 1089082), (40, 544541), (191, 114040), (382, 57020), (764, 28510), (955, 22808), (1528, 14255), (1910, 11404), (2851, 7640), (3820, 5702)]