21157255

素因数分解:

$5^1\times 7^1\times {\mathrm{149}}^1\times {\mathrm{4057}}^1$

素因数の和:4218

約数の個数: 16

約数和(自身を含む): 29217600

約数和(自身を除く): 8060345

約数列:

[1, 5, 7, 35, 149, 745, 1043, 4057, 5215, 20285, 28399, 141995, 604493, 3022465, 4231451, 21157255]

約数ペア:

[(1, 21157255), (5, 4231451), (7, 3022465), (35, 604493), (149, 141995), (745, 28399), (1043, 20285), (4057, 5215)]