21156980

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{81373}}^1$

素因数の和:81395

約数の個数: 24

約数和(自身を含む): 47847912

約数和(自身を除く): 26690932

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 81373, 162746, 325492, 406865, 813730, 1057849, 1627460, 2115698, 4231396, 5289245, 10578490, 21156980]

約数ペア:

[(1, 21156980), (2, 10578490), (4, 5289245), (5, 4231396), (10, 2115698), (13, 1627460), (20, 1057849), (26, 813730), (52, 406865), (65, 325492), (130, 162746), (260, 81373)]