21646225

素因数分解:

$5^2\times {\mathrm{19}}^1\times {\mathrm{199}}^1\times {\mathrm{229}}^1$

素因数の和:457

約数の個数: 24

約数和(自身を含む): 28520000

約数和(自身を除く): 6873775

約数列:

[1, 5, 19, 25, 95, 199, 229, 475, 995, 1145, 3781, 4351, 4975, 5725, 18905, 21755, 45571, 94525, 108775, 227855, 865849, 1139275, 4329245, 21646225]

約数ペア:

[(1, 21646225), (5, 4329245), (19, 1139275), (25, 865849), (95, 227855), (199, 108775), (229, 94525), (475, 45571), (995, 21755), (1145, 18905), (3781, 5725), (4351, 4975)]