21640820

素因数分解:

$2^2\times 5^1\times {\mathrm{313}}^1\times {\mathrm{3457}}^1$

素因数の和:3779

約数の個数: 24

約数和(自身を含む): 45604104

約数和(自身を除く): 23963284

約数列:

[1, 2, 4, 5, 10, 20, 313, 626, 1252, 1565, 3130, 3457, 6260, 6914, 13828, 17285, 34570, 69140, 1082041, 2164082, 4328164, 5410205, 10820410, 21640820]

約数ペア:

[(1, 21640820), (2, 10820410), (4, 5410205), (5, 4328164), (10, 2164082), (20, 1082041), (313, 69140), (626, 34570), (1252, 17285), (1565, 13828), (3130, 6914), (3457, 6260)]