18991.000000

素因数分解:

$3^3\times {\mathrm{43}}^1\times {\mathrm{439}}^1$

素因数の和:491

約数の個数: 16

約数和(自身を含む): 774400

約数和(自身を除く): 264721

約数列:

[1, 3, 9, 27, 43, 129, 387, 439, 1161, 1317, 3951, 11853, 18877, 56631, 169893, 509679]

約数ペア:

[(1, 509679), (3, 169893), (9, 56631), (27, 18877), (43, 11853), (129, 3951), (387, 1317), (439, 1161)]