20921380857

素因数分解:

$3^2\times {\mathrm{13}}^2\times {\mathrm{13755017}}^1$

素因数の和:13755049

約数の個数: 18

約数和(自身を含む): 32723187822

約数和(自身を除く): 11801806965

約数列:

[1, 3, 9, 13, 39, 117, 169, 507, 1521, 13755017, 41265051, 123795153, 178815221, 536445663, 1609336989, 2324597873, 6973793619, 20921380857]

約数ペア:

[(1, 20921380857), (3, 6973793619), (9, 2324597873), (13, 1609336989), (39, 536445663), (117, 178815221), (169, 123795153), (507, 41265051), (1521, 13755017)]