21377905

素因数分解:

$5^1\times {\mathrm{113}}^1\times {\mathrm{157}}^1\times {\mathrm{241}}^1$

素因数の和:516

約数の個数: 16

約数和(自身を含む): 26153424

約数和(自身を除く): 4775519

約数列:

[1, 5, 113, 157, 241, 565, 785, 1205, 17741, 27233, 37837, 88705, 136165, 189185, 4275581, 21377905]

約数ペア:

[(1, 21377905), (5, 4275581), (113, 189185), (157, 136165), (241, 88705), (565, 37837), (785, 27233), (1205, 17741)]