21271985

素因数分解:

$5^1\times 7^1\times {\mathrm{149}}^1\times {\mathrm{4079}}^1$

素因数の和:4240

約数の個数: 16

約数和(自身を含む): 29376000

約数和(自身を除く): 8104015

約数列:

[1, 5, 7, 35, 149, 745, 1043, 4079, 5215, 20395, 28553, 142765, 607771, 3038855, 4254397, 21271985]

約数ペア:

[(1, 21271985), (5, 4254397), (7, 3038855), (35, 607771), (149, 142765), (745, 28553), (1043, 20395), (4079, 5215)]