18891665

素因数分解:

$5^1\times {\mathrm{13}}^2\times {\mathrm{79}}^1\times {\mathrm{283}}^1$

素因数の和:393

約数の個数: 24

約数和(自身を含む): 24946560

約数和(自身を除く): 6054895

約数列:

[1, 5, 13, 65, 79, 169, 283, 395, 845, 1027, 1415, 3679, 5135, 13351, 18395, 22357, 47827, 66755, 111785, 239135, 290641, 1453205, 3778333, 18891665]

約数ペア:

[(1, 18891665), (5, 3778333), (13, 1453205), (65, 290641), (79, 239135), (169, 111785), (283, 66755), (395, 47827), (845, 22357), (1027, 18395), (1415, 13351), (3679, 5135)]