21238749

素因数分解:

$3^2\times 7^1\times {\mathrm{443}}^1\times {\mathrm{761}}^1$

素因数の和:1217

約数の個数: 24

約数和(自身を含む): 35186112

約数和(自身を除く): 13947363

約数列:

[1, 3, 7, 9, 21, 63, 443, 761, 1329, 2283, 3101, 3987, 5327, 6849, 9303, 15981, 27909, 47943, 337123, 1011369, 2359861, 3034107, 7079583, 21238749]

約数ペア:

[(1, 21238749), (3, 7079583), (7, 3034107), (9, 2359861), (21, 1011369), (63, 337123), (443, 47943), (761, 27909), (1329, 15981), (2283, 9303), (3101, 6849), (3987, 5327)]