17920721

素因数分解:

$7^3\times {\mathrm{13}}^1\times {\mathrm{4019}}^1$

素因数の和:4053

約数の個数: 16

約数和(自身を含む): 22512000

約数和(自身を除く): 4591279

約数列:

[1, 7, 13, 49, 91, 343, 637, 4019, 4459, 28133, 52247, 196931, 365729, 1378517, 2560103, 17920721]

約数ペア:

[(1, 17920721), (7, 2560103), (13, 1378517), (49, 365729), (91, 196931), (343, 52247), (637, 28133), (4019, 4459)]