20909725

素因数分解:

$5^2\times {\mathrm{29}}^1\times {\mathrm{151}}^1\times {\mathrm{191}}^1$

素因数の和:381

約数の個数: 24

約数和(自身を含む): 27141120

約数和(自身を除く): 6231395

約数列:

[1, 5, 25, 29, 145, 151, 191, 725, 755, 955, 3775, 4379, 4775, 5539, 21895, 27695, 28841, 109475, 138475, 144205, 721025, 836389, 4181945, 20909725]

約数ペア:

[(1, 20909725), (5, 4181945), (25, 836389), (29, 721025), (145, 144205), (151, 138475), (191, 109475), (725, 28841), (755, 27695), (955, 21895), (3775, 5539), (4379, 4775)]