21122140

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{81239}}^1$

素因数の和:81261

約数の個数: 24

約数和(自身を含む): 47769120

約数和(自身を除く): 26646980

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 81239, 162478, 324956, 406195, 812390, 1056107, 1624780, 2112214, 4224428, 5280535, 10561070, 21122140]

約数ペア:

[(1, 21122140), (2, 10561070), (4, 5280535), (5, 4224428), (10, 2112214), (13, 1624780), (20, 1056107), (26, 812390), (52, 406195), (65, 324956), (130, 162478), (260, 81239)]