21006621

素因数分解:

$3^5\times {\mathrm{137}}^1\times {\mathrm{631}}^1$

素因数の和:783

約数の個数: 24

約数和(自身を含む): 31746624

約数和(自身を除く): 10740003

約数列:

[1, 3, 9, 27, 81, 137, 243, 411, 631, 1233, 1893, 3699, 5679, 11097, 17037, 33291, 51111, 86447, 153333, 259341, 778023, 2334069, 7002207, 21006621]

約数ペア:

[(1, 21006621), (3, 7002207), (9, 2334069), (27, 778023), (81, 259341), (137, 153333), (243, 86447), (411, 51111), (631, 33291), (1233, 17037), (1893, 11097), (3699, 5679)]