21516813

素因数分解:

$3^3\times {\mathrm{43}}^2\times {\mathrm{431}}^1$

素因数の和:526

約数の個数: 24

約数和(自身を含む): 32711040

約数和(自身を除く): 11194227

約数列:

[1, 3, 9, 27, 43, 129, 387, 431, 1161, 1293, 1849, 3879, 5547, 11637, 16641, 18533, 49923, 55599, 166797, 500391, 796919, 2390757, 7172271, 21516813]

約数ペア:

[(1, 21516813), (3, 7172271), (9, 2390757), (27, 796919), (43, 500391), (129, 166797), (387, 55599), (431, 49923), (1161, 18533), (1293, 16641), (1849, 11637), (3879, 5547)]