21421805

素因数分解:

$5^1\times {\mathrm{53}}^1\times {\mathrm{229}}^1\times {\mathrm{353}}^1$

素因数の和:640

約数の個数: 16

約数和(自身を含む): 26380080

約数和(自身を除く): 4958275

約数列:

[1, 5, 53, 229, 265, 353, 1145, 1765, 12137, 18709, 60685, 80837, 93545, 404185, 4284361, 21421805]

約数ペア:

[(1, 21421805), (5, 4284361), (53, 404185), (229, 93545), (265, 80837), (353, 60685), (1145, 18709), (1765, 12137)]