21921991

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{409}}^1$

素因数の和:479

約数の個数: 32

約数和(自身を含む): 29388800

約数和(自身を除く): 7466809

約数列:

[1, 7, 13, 19, 31, 91, 133, 217, 247, 403, 409, 589, 1729, 2821, 2863, 4123, 5317, 7657, 7771, 12679, 37219, 53599, 54397, 88753, 101023, 164827, 240901, 707161, 1153789, 1686307, 3131713, 21921991]

約数ペア:

[(1, 21921991), (7, 3131713), (13, 1686307), (19, 1153789), (31, 707161), (91, 240901), (133, 164827), (217, 101023), (247, 88753), (403, 54397), (409, 53599), (589, 37219), (1729, 12679), (2821, 7771), (2863, 7657), (4123, 5317)]