21259940

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{81769}}^1$

素因数の和:81791

約数の個数: 24

約数和(自身を含む): 48080760

約数和(自身を除く): 26820820

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 81769, 163538, 327076, 408845, 817690, 1062997, 1635380, 2125994, 4251988, 5314985, 10629970, 21259940]

約数ペア:

[(1, 21259940), (2, 10629970), (4, 5314985), (5, 4251988), (10, 2125994), (13, 1635380), (20, 1062997), (26, 817690), (52, 408845), (65, 327076), (130, 163538), (260, 81769)]