21811985

素因数分解:

$5^1\times {\mathrm{13}}^2\times {\mathrm{83}}^1\times {\mathrm{311}}^1$

素因数の和:425

約数の個数: 24

約数和(自身を含む): 28776384

約数和(自身を除く): 6964399

約数列:

[1, 5, 13, 65, 83, 169, 311, 415, 845, 1079, 1555, 4043, 5395, 14027, 20215, 25813, 52559, 70135, 129065, 262795, 335569, 1677845, 4362397, 21811985]

約数ペア:

[(1, 21811985), (5, 4362397), (13, 1677845), (65, 335569), (83, 262795), (169, 129065), (311, 70135), (415, 52559), (845, 25813), (1079, 20215), (1555, 14027), (4043, 5395)]