20991885

素因数分解:

$3^1\times 5^1\times {\mathrm{1061}}^1\times {\mathrm{1319}}^1$

素因数の和:2388

約数の個数: 16

約数和(自身を含む): 33644160

約数和(自身を除く): 12652275

約数列:

[1, 3, 5, 15, 1061, 1319, 3183, 3957, 5305, 6595, 15915, 19785, 1399459, 4198377, 6997295, 20991885]

約数ペア:

[(1, 20991885), (3, 6997295), (5, 4198377), (15, 1399459), (1061, 19785), (1319, 15915), (3183, 6595), (3957, 5305)]