21985495

素因数分解:

$5^1\times 7^1\times {\mathrm{157}}^1\times {\mathrm{4001}}^1$

素因数の和:4170

約数の個数: 16

約数和(自身を含む): 30351168

約数和(自身を除く): 8365673

約数列:

[1, 5, 7, 35, 157, 785, 1099, 4001, 5495, 20005, 28007, 140035, 628157, 3140785, 4397099, 21985495]

約数ペア:

[(1, 21985495), (5, 4397099), (7, 3140785), (35, 628157), (157, 140035), (785, 28007), (1099, 20005), (4001, 5495)]