18820971

素因数分解:

$3^3\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{43}}^2$

素因数の和:137

約数の個数: 48

約数和(自身を含む): 31802400

約数和(自身を除く): 12981429

約数列:

[1, 3, 9, 13, 27, 29, 39, 43, 87, 117, 129, 261, 351, 377, 387, 559, 783, 1131, 1161, 1247, 1677, 1849, 3393, 3741, 5031, 5547, 10179, 11223, 15093, 16211, 16641, 24037, 33669, 48633, 49923, 53621, 72111, 145899, 160863, 216333, 437697, 482589, 648999, 697073, 1447767, 2091219, 6273657, 18820971]

約数ペア:

[(1, 18820971), (3, 6273657), (9, 2091219), (13, 1447767), (27, 697073), (29, 648999), (39, 482589), (43, 437697), (87, 216333), (117, 160863), (129, 145899), (261, 72111), (351, 53621), (377, 49923), (387, 48633), (559, 33669), (783, 24037), (1131, 16641), (1161, 16211), (1247, 15093), (1677, 11223), (1849, 10179), (3393, 5547), (3741, 5031)]