21089780

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{137}}^1\times {\mathrm{179}}^1$

素因数の和:368

約数の個数: 48

約数和(自身を含む): 45904320

約数和(自身を除く): 24814540

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 137, 172, 179, 215, 274, 358, 430, 548, 685, 716, 860, 895, 1370, 1790, 2740, 3580, 5891, 7697, 11782, 15394, 23564, 24523, 29455, 30788, 38485, 49046, 58910, 76970, 98092, 117820, 122615, 153940, 245230, 490460, 1054489, 2108978, 4217956, 5272445, 10544890, 21089780]

約数ペア:

[(1, 21089780), (2, 10544890), (4, 5272445), (5, 4217956), (10, 2108978), (20, 1054489), (43, 490460), (86, 245230), (137, 153940), (172, 122615), (179, 117820), (215, 98092), (274, 76970), (358, 58910), (430, 49046), (548, 38485), (685, 30788), (716, 29455), (860, 24523), (895, 23564), (1370, 15394), (1790, 11782), (2740, 7697), (3580, 5891)]