17978121

素因数分解:

$3^2\times 7^1\times {\mathrm{139}}^1\times {\mathrm{2053}}^1$

素因数の和:2205

約数の個数: 24

約数和(自身を含む): 29906240

約数和(自身を除く): 11928119

約数列:

[1, 3, 7, 9, 21, 63, 139, 417, 973, 1251, 2053, 2919, 6159, 8757, 14371, 18477, 43113, 129339, 285367, 856101, 1997569, 2568303, 5992707, 17978121]

約数ペア:

[(1, 17978121), (3, 5992707), (7, 2568303), (9, 1997569), (21, 856101), (63, 285367), (139, 129339), (417, 43113), (973, 18477), (1251, 14371), (2053, 8757), (2919, 6159)]