21971225

素因数分解:

$5^2\times {\mathrm{17}}^2\times {\mathrm{3041}}^1$

素因数の和:3085

約数の個数: 18

約数和(自身を含む): 28950714

約数和(自身を除く): 6979489

約数列:

[1, 5, 17, 25, 85, 289, 425, 1445, 3041, 7225, 15205, 51697, 76025, 258485, 878849, 1292425, 4394245, 21971225]

約数ペア:

[(1, 21971225), (5, 4394245), (17, 1292425), (25, 878849), (85, 258485), (289, 76025), (425, 51697), (1445, 15205), (3041, 7225)]