20991607

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{389}}^1\times {\mathrm{593}}^1$

素因数の和:1002

約数の個数: 16

約数和(自身を含む): 25945920

約数和(自身を除く): 4954313

約数列:

[1, 7, 13, 91, 389, 593, 2723, 4151, 5057, 7709, 35399, 53963, 230677, 1614739, 2998801, 20991607]

約数ペア:

[(1, 20991607), (7, 2998801), (13, 1614739), (91, 230677), (389, 53963), (593, 35399), (2723, 7709), (4151, 5057)]