19728723

素因数分解:

$3^1\times 7^2\times {\mathrm{103}}^1\times {\mathrm{1303}}^1$

素因数の和:1423

約数の個数: 24

約数和(自身を含む): 30920448

約数和(自身を除く): 11191725

約数列:

[1, 3, 7, 21, 49, 103, 147, 309, 721, 1303, 2163, 3909, 5047, 9121, 15141, 27363, 63847, 134209, 191541, 402627, 939463, 2818389, 6576241, 19728723]

約数ペア:

[(1, 19728723), (3, 6576241), (7, 2818389), (21, 939463), (49, 402627), (103, 191541), (147, 134209), (309, 63847), (721, 27363), (1303, 15141), (2163, 9121), (3909, 5047)]