19901619

素因数分解:

$3^4\times {\mathrm{277}}^1\times {\mathrm{887}}^1$

素因数の和:1176

約数の個数: 20

約数和(自身を含む): 29870544

約数和(自身を除く): 9968925

約数列:

[1, 3, 9, 27, 81, 277, 831, 887, 2493, 2661, 7479, 7983, 22437, 23949, 71847, 245699, 737097, 2211291, 6633873, 19901619]

約数ペア:

[(1, 19901619), (3, 6633873), (9, 2211291), (27, 737097), (81, 245699), (277, 71847), (831, 23949), (887, 22437), (2493, 7983), (2661, 7479)]