20634640

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19841}}^1$

素因数の和:19867

約数の個数: 40

約数和(自身を含む): 51668568

約数和(自身を除く): 31033928

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 19841, 39682, 79364, 99205, 158728, 198410, 257933, 317456, 396820, 515866, 793640, 1031732, 1289665, 1587280, 2063464, 2579330, 4126928, 5158660, 10317320, 20634640]

約数ペア:

[(1, 20634640), (2, 10317320), (4, 5158660), (5, 4126928), (8, 2579330), (10, 2063464), (13, 1587280), (16, 1289665), (20, 1031732), (26, 793640), (40, 515866), (52, 396820), (65, 317456), (80, 257933), (104, 198410), (130, 158728), (208, 99205), (260, 79364), (520, 39682), (1040, 19841)]