21137740

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{81299}}^1$

素因数の和:81321

約数の個数: 24

約数和(自身を含む): 47804400

約数和(自身を除く): 26666660

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 81299, 162598, 325196, 406495, 812990, 1056887, 1625980, 2113774, 4227548, 5284435, 10568870, 21137740]

約数ペア:

[(1, 21137740), (2, 10568870), (4, 5284435), (5, 4227548), (10, 2113774), (13, 1625980), (20, 1056887), (26, 812990), (52, 406495), (65, 325196), (130, 162598), (260, 81299)]