21019490

素因数分解:

$2^1\times 5^1\times {\mathrm{29}}^1\times {\mathrm{72481}}^1$

素因数の和:72517

約数の個数: 16

約数和(自身を含む): 39140280

約数和(自身を除く): 18120790

約数列:

[1, 2, 5, 10, 29, 58, 145, 290, 72481, 144962, 362405, 724810, 2101949, 4203898, 10509745, 21019490]

約数ペア:

[(1, 21019490), (2, 10509745), (5, 4203898), (10, 2101949), (29, 724810), (58, 362405), (145, 144962), (290, 72481)]