19811519

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{61}}^1\times {\mathrm{83}}^1$

素因数の和:207

約数の個数: 32

約数和(自身を含む): 25665024

約数和(自身を除く): 5853505

約数列:

[1, 7, 13, 43, 61, 83, 91, 301, 427, 559, 581, 793, 1079, 2623, 3569, 3913, 5063, 5551, 7553, 18361, 24983, 34099, 35441, 46397, 65819, 217709, 238693, 324779, 460733, 1523963, 2830217, 19811519]

約数ペア:

[(1, 19811519), (7, 2830217), (13, 1523963), (43, 460733), (61, 324779), (83, 238693), (91, 217709), (301, 65819), (427, 46397), (559, 35441), (581, 34099), (793, 24983), (1079, 18361), (2623, 7553), (3569, 5551), (3913, 5063)]