21238940

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{14957}}^1$

素因数の和:15037

約数の個数: 24

約数和(自身を含む): 45232992

約数和(自身を除く): 23994052

約数列:

[1, 2, 4, 5, 10, 20, 71, 142, 284, 355, 710, 1420, 14957, 29914, 59828, 74785, 149570, 299140, 1061947, 2123894, 4247788, 5309735, 10619470, 21238940]

約数ペア:

[(1, 21238940), (2, 10619470), (4, 5309735), (5, 4247788), (10, 2123894), (20, 1061947), (71, 299140), (142, 149570), (284, 74785), (355, 59828), (710, 29914), (1420, 14957)]