21189890

素因数分解:

$2^1\times 5^1\times {\mathrm{379}}^1\times {\mathrm{5591}}^1$

素因数の和:5977

約数の個数: 16

約数和(自身を含む): 38249280

約数和(自身を除く): 17059390

約数列:

[1, 2, 5, 10, 379, 758, 1895, 3790, 5591, 11182, 27955, 55910, 2118989, 4237978, 10594945, 21189890]

約数ペア:

[(1, 21189890), (2, 10594945), (5, 4237978), (10, 2118989), (379, 55910), (758, 27955), (1895, 11182), (3790, 5591)]