21210940

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{25867}}^1$

素因数の和:25917

約数の個数: 24

約数和(自身を含む): 45631152

約数和(自身を除く): 24420212

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 25867, 51734, 103468, 129335, 258670, 517340, 1060547, 2121094, 4242188, 5302735, 10605470, 21210940]

約数ペア:

[(1, 21210940), (2, 10605470), (4, 5302735), (5, 4242188), (10, 2121094), (20, 1060547), (41, 517340), (82, 258670), (164, 129335), (205, 103468), (410, 51734), (820, 25867)]