20688031

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{311}}^1$

素因数の和:391

約数の個数: 32

約数和(自身を含む): 27675648

約数和(自身を除く): 6987617

約数列:

[1, 7, 13, 17, 43, 91, 119, 221, 301, 311, 559, 731, 1547, 2177, 3913, 4043, 5117, 5287, 9503, 13373, 28301, 37009, 66521, 68731, 93611, 173849, 227341, 481117, 1216943, 1591387, 2955433, 20688031]

約数ペア:

[(1, 20688031), (7, 2955433), (13, 1591387), (17, 1216943), (43, 481117), (91, 227341), (119, 173849), (221, 93611), (301, 68731), (311, 66521), (559, 37009), (731, 28301), (1547, 13373), (2177, 9503), (3913, 5287), (4043, 5117)]