21128905

素因数分解:

$5^1\times 7^1\times {\mathrm{103}}^1\times {\mathrm{5861}}^1$

素因数の和:5976

約数の個数: 16

約数和(自身を含む): 29263104

約数和(自身を除く): 8134199

約数列:

[1, 5, 7, 35, 103, 515, 721, 3605, 5861, 29305, 41027, 205135, 603683, 3018415, 4225781, 21128905]

約数ペア:

[(1, 21128905), (5, 4225781), (7, 3018415), (35, 603683), (103, 205135), (515, 41027), (721, 29305), (3605, 5861)]