20980775

素因数分解:

$5^2\times {\mathrm{29}}^1\times {\mathrm{43}}^1\times {\mathrm{673}}^1$

素因数の和:755

約数の個数: 24

約数和(自身を含む): 27580080

約数和(自身を除く): 6599305

約数列:

[1, 5, 25, 29, 43, 145, 215, 673, 725, 1075, 1247, 3365, 6235, 16825, 19517, 28939, 31175, 97585, 144695, 487925, 723475, 839231, 4196155, 20980775]

約数ペア:

[(1, 20980775), (5, 4196155), (25, 839231), (29, 723475), (43, 487925), (145, 144695), (215, 97585), (673, 31175), (725, 28939), (1075, 19517), (1247, 16825), (3365, 6235)]