21563540

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{26297}}^1$

素因数の和:26347

約数の個数: 24

約数和(自身を含む): 46389672

約数和(自身を除く): 24826132

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 26297, 52594, 105188, 131485, 262970, 525940, 1078177, 2156354, 4312708, 5390885, 10781770, 21563540]

約数ペア:

[(1, 21563540), (2, 10781770), (4, 5390885), (5, 4312708), (10, 2156354), (20, 1078177), (41, 525940), (82, 262970), (164, 131485), (205, 105188), (410, 52594), (820, 26297)]