21715180

素因数分解:

$2^2\times 5^1\times {\mathrm{421}}^1\times {\mathrm{2579}}^1$

素因数の和:3009

約数の個数: 24

約数和(自身を含む): 45727920

約数和(自身を除く): 24012740

約数列:

[1, 2, 4, 5, 10, 20, 421, 842, 1684, 2105, 2579, 4210, 5158, 8420, 10316, 12895, 25790, 51580, 1085759, 2171518, 4343036, 5428795, 10857590, 21715180]

約数ペア:

[(1, 21715180), (2, 10857590), (4, 5428795), (5, 4343036), (10, 2171518), (20, 1085759), (421, 51580), (842, 25790), (1684, 12895), (2105, 10316), (2579, 8420), (4210, 5158)]