19420709

素因数分解:

$7^2\times {\mathrm{11}}^1\times {\mathrm{137}}^1\times {\mathrm{263}}^1$

素因数の和:425

約数の個数: 24

約数和(自身を含む): 24919488

約数和(自身を除く): 5498779

約数列:

[1, 7, 11, 49, 77, 137, 263, 539, 959, 1507, 1841, 2893, 6713, 10549, 12887, 20251, 36031, 73843, 141757, 252217, 396341, 1765519, 2774387, 19420709]

約数ペア:

[(1, 19420709), (7, 2774387), (11, 1765519), (49, 396341), (77, 252217), (137, 141757), (263, 73843), (539, 36031), (959, 20251), (1507, 12887), (1841, 10549), (2893, 6713)]