21009235

素因数分解:

$5^1\times {\mathrm{13}}^2\times {\mathrm{23}}^2\times {\mathrm{47}}^1$

素因数の和:124

約数の個数: 36

約数和(自身を含む): 29145312

約数和(自身を除く): 8136077

約数列:

[1, 5, 13, 23, 47, 65, 115, 169, 235, 299, 529, 611, 845, 1081, 1495, 2645, 3055, 3887, 5405, 6877, 7943, 14053, 19435, 24863, 34385, 39715, 70265, 89401, 124315, 182689, 323219, 447005, 913445, 1616095, 4201847, 21009235]

約数ペア:

[(1, 21009235), (5, 4201847), (13, 1616095), (23, 913445), (47, 447005), (65, 323219), (115, 182689), (169, 124315), (235, 89401), (299, 70265), (529, 39715), (611, 34385), (845, 24863), (1081, 19435), (1495, 14053), (2645, 7943), (3055, 6877), (3887, 5405)]