20521975

素因数分解:

$5^2\times {\mathrm{17}}^1\times {\mathrm{109}}^1\times {\mathrm{443}}^1$

素因数の和:579

約数の個数: 24

約数和(自身を含む): 27252720

約数和(自身を除く): 6730745

約数列:

[1, 5, 17, 25, 85, 109, 425, 443, 545, 1853, 2215, 2725, 7531, 9265, 11075, 37655, 46325, 48287, 188275, 241435, 820879, 1207175, 4104395, 20521975]

約数ペア:

[(1, 20521975), (5, 4104395), (17, 1207175), (25, 820879), (85, 241435), (109, 188275), (425, 48287), (443, 46325), (545, 37655), (1853, 11075), (2215, 9265), (2725, 7531)]