21131789

素因数分解:

$7^2\times {\mathrm{53}}^1\times {\mathrm{79}}^1\times {\mathrm{103}}^1$

素因数の和:249

約数の個数: 24

約数和(自身を含む): 25608960

約数和(自身を除く): 4477171

約数列:

[1, 7, 49, 53, 79, 103, 371, 553, 721, 2597, 3871, 4187, 5047, 5459, 8137, 29309, 38213, 56959, 205163, 267491, 398713, 431261, 3018827, 21131789]

約数ペア:

[(1, 21131789), (7, 3018827), (49, 431261), (53, 398713), (79, 267491), (103, 205163), (371, 56959), (553, 38213), (721, 29309), (2597, 8137), (3871, 5459), (4187, 5047)]