20209217

素因数分解:

$7^4\times {\mathrm{19}}^1\times {\mathrm{443}}^1$

素因数の和:490

約数の個数: 20

約数和(自身を含む): 24872880

約数和(自身を除く): 4663663

約数列:

[1, 7, 19, 49, 133, 343, 443, 931, 2401, 3101, 6517, 8417, 21707, 45619, 58919, 151949, 412433, 1063643, 2887031, 20209217]

約数ペア:

[(1, 20209217), (7, 2887031), (19, 1063643), (49, 412433), (133, 151949), (343, 58919), (443, 45619), (931, 21707), (2401, 8417), (3101, 6517)]