18718721

素因数分解:

$7^1\times {\mathrm{131}}^1\times {\mathrm{137}}^1\times {\mathrm{149}}^1$

素因数の和:424

約数の個数: 16

約数和(自身を含む): 21859200

約数和(自身を除く): 3140479

約数列:

[1, 7, 131, 137, 149, 917, 959, 1043, 17947, 19519, 20413, 125629, 136633, 142891, 2674103, 18718721]

約数ペア:

[(1, 18718721), (7, 2674103), (131, 142891), (137, 136633), (149, 125629), (917, 20413), (959, 19519), (1043, 17947)]