18690217

素因数分解:

$7^2\times {\mathrm{13}}^2\times {\mathrm{37}}^1\times {\mathrm{61}}^1$

素因数の和:138

約数の個数: 36

約数和(自身を含む): 24575436

約数和(自身を除く): 5885219

約数列:

[1, 7, 13, 37, 49, 61, 91, 169, 259, 427, 481, 637, 793, 1183, 1813, 2257, 2989, 3367, 5551, 6253, 8281, 10309, 15799, 23569, 29341, 38857, 43771, 72163, 110593, 205387, 306397, 381433, 505141, 1437709, 2670031, 18690217]

約数ペア:

[(1, 18690217), (7, 2670031), (13, 1437709), (37, 505141), (49, 381433), (61, 306397), (91, 205387), (169, 110593), (259, 72163), (427, 43771), (481, 38857), (637, 29341), (793, 23569), (1183, 15799), (1813, 10309), (2257, 8281), (2989, 6253), (3367, 5551)]