21791495

素因数分解:

$5^1\times {\mathrm{11}}^2\times {\mathrm{181}}^1\times {\mathrm{199}}^1$

素因数の和:407

約数の個数: 24

約数和(自身を含む): 29047200

約数和(自身を除く): 7255705

約数列:

[1, 5, 11, 55, 121, 181, 199, 605, 905, 995, 1991, 2189, 9955, 10945, 21901, 24079, 36019, 109505, 120395, 180095, 396209, 1981045, 4358299, 21791495]

約数ペア:

[(1, 21791495), (5, 4358299), (11, 1981045), (55, 396209), (121, 180095), (181, 120395), (199, 109505), (605, 36019), (905, 24079), (995, 21901), (1991, 10945), (2189, 9955)]