20991645

素因数分解:

$3^2\times 5^1\times {\mathrm{193}}^1\times {\mathrm{2417}}^1$

素因数の和:2621

約数の個数: 24

約数和(自身を含む): 36589176

約数和(自身を除く): 15597531

約数列:

[1, 3, 5, 9, 15, 45, 193, 579, 965, 1737, 2417, 2895, 7251, 8685, 12085, 21753, 36255, 108765, 466481, 1399443, 2332405, 4198329, 6997215, 20991645]

約数ペア:

[(1, 20991645), (3, 6997215), (5, 4198329), (9, 2332405), (15, 1399443), (45, 466481), (193, 108765), (579, 36255), (965, 21753), (1737, 12085), (2417, 8685), (2895, 7251)]