21991655

素因数分解:

$5^1\times 7^1\times {\mathrm{149}}^1\times {\mathrm{4217}}^1$

素因数の和:4378

約数の個数: 16

約数和(自身を含む): 30369600

約数和(自身を除く): 8377945

約数列:

[1, 5, 7, 35, 149, 745, 1043, 4217, 5215, 21085, 29519, 147595, 628333, 3141665, 4398331, 21991655]

約数ペア:

[(1, 21991655), (5, 4398331), (7, 3141665), (35, 628333), (149, 147595), (745, 29519), (1043, 21085), (4217, 5215)]