21285940

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{81869}}^1$

素因数の和:81891

約数の個数: 24

約数和(自身を含む): 48139560

約数和(自身を除く): 26853620

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 81869, 163738, 327476, 409345, 818690, 1064297, 1637380, 2128594, 4257188, 5321485, 10642970, 21285940]

約数ペア:

[(1, 21285940), (2, 10642970), (4, 5321485), (5, 4257188), (10, 2128594), (13, 1637380), (20, 1064297), (26, 818690), (52, 409345), (65, 327476), (130, 163738), (260, 81869)]