21239939

素因数分解:

$7^1\times {\mathrm{89}}^1\times {\mathrm{103}}^1\times {\mathrm{331}}^1$

素因数の和:530

約数の個数: 16

約数和(自身を含む): 24860160

約数和(自身を除く): 3620221

約数列:

[1, 7, 89, 103, 331, 623, 721, 2317, 9167, 29459, 34093, 64169, 206213, 238651, 3034277, 21239939]

約数ペア:

[(1, 21239939), (7, 3034277), (89, 238651), (103, 206213), (331, 64169), (623, 34093), (721, 29459), (2317, 9167)]