21281185

素因数分解:

$5^1\times {\mathrm{71}}^1\times {\mathrm{151}}^1\times {\mathrm{397}}^1$

素因数の和:624

約数の個数: 16

約数和(自身を含む): 26134272

約数和(自身を除く): 4853087

約数列:

[1, 5, 71, 151, 355, 397, 755, 1985, 10721, 28187, 53605, 59947, 140935, 299735, 4256237, 21281185]

約数ペア:

[(1, 21281185), (5, 4256237), (71, 299735), (151, 140935), (355, 59947), (397, 53605), (755, 28187), (1985, 10721)]