21808521

素因数分解:

$3^5\times 7^1\times {\mathrm{12821}}^1$

素因数の和:12843

約数の個数: 24

約数和(自身を含む): 37337664

約数和(自身を除く): 15529143

約数列:

[1, 3, 7, 9, 21, 27, 63, 81, 189, 243, 567, 1701, 12821, 38463, 89747, 115389, 269241, 346167, 807723, 1038501, 2423169, 3115503, 7269507, 21808521]

約数ペア:

[(1, 21808521), (3, 7269507), (7, 3115503), (9, 2423169), (21, 1038501), (27, 807723), (63, 346167), (81, 269241), (189, 115389), (243, 89747), (567, 38463), (1701, 12821)]