18990993

素因数分解:

$3^1\times 7^1\times {\mathrm{43}}^1\times {\mathrm{21031}}^1$

素因数の和:21084

約数の個数: 16

約数和(自身を含む): 29613056

約数和(自身を除く): 10622063

約数列:

[1, 3, 7, 21, 43, 129, 301, 903, 21031, 63093, 147217, 441651, 904333, 2712999, 6330331, 18990993]

約数ペア:

[(1, 18990993), (3, 6330331), (7, 2712999), (21, 904333), (43, 441651), (129, 147217), (301, 63093), (903, 21031)]