21517811

素因数分解:

$7^2\times {\mathrm{23}}^1\times {\mathrm{61}}^1\times {\mathrm{313}}^1$

素因数の和:411

約数の個数: 24

約数和(自身を含む): 26632224

約数和(自身を除く): 5114413

約数列:

[1, 7, 23, 49, 61, 161, 313, 427, 1127, 1403, 2191, 2989, 7199, 9821, 15337, 19093, 50393, 68747, 133651, 352751, 439139, 935557, 3073973, 21517811]

約数ペア:

[(1, 21517811), (7, 3073973), (23, 935557), (49, 439139), (61, 352751), (161, 133651), (313, 68747), (427, 50393), (1127, 19093), (1403, 15337), (2191, 9821), (2989, 7199)]