20906821

素因数分解:

${\mathrm{13}}^2\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{383}}^1$

素因数の和:445

約数の個数: 24

約数和(自身を含む): 25297920

約数和(自身を除く): 4391099

約数列:

[1, 13, 17, 19, 169, 221, 247, 323, 383, 2873, 3211, 4199, 4979, 6511, 7277, 54587, 64727, 84643, 94601, 123709, 1100359, 1229813, 1608217, 20906821]

約数ペア:

[(1, 20906821), (13, 1608217), (17, 1229813), (19, 1100359), (169, 123709), (221, 94601), (247, 84643), (323, 64727), (383, 54587), (2873, 7277), (3211, 6511), (4199, 4979)]