21812825

素因数分解:

$5^2\times {\mathrm{43}}^1\times {\mathrm{103}}^1\times {\mathrm{197}}^1$

素因数の和:353

約数の個数: 24

約数和(自身を含む): 28087488

約数和(自身を除く): 6274663

約数列:

[1, 5, 25, 43, 103, 197, 215, 515, 985, 1075, 2575, 4429, 4925, 8471, 20291, 22145, 42355, 101455, 110725, 211775, 507275, 872513, 4362565, 21812825]

約数ペア:

[(1, 21812825), (5, 4362565), (25, 872513), (43, 507275), (103, 211775), (197, 110725), (215, 101455), (515, 42355), (985, 22145), (1075, 20291), (2575, 8471), (4429, 4925)]