20468240

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19681}}^1$

素因数の和:19707

約数の個数: 40

約数和(自身を含む): 51251928

約数和(自身を除く): 30783688

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 19681, 39362, 78724, 98405, 157448, 196810, 255853, 314896, 393620, 511706, 787240, 1023412, 1279265, 1574480, 2046824, 2558530, 4093648, 5117060, 10234120, 20468240]

約数ペア:

[(1, 20468240), (2, 10234120), (4, 5117060), (5, 4093648), (8, 2558530), (10, 2046824), (13, 1574480), (16, 1279265), (20, 1023412), (26, 787240), (40, 511706), (52, 393620), (65, 314896), (80, 255853), (104, 196810), (130, 157448), (208, 98405), (260, 78724), (520, 39362), (1040, 19681)]