20998521

素因数分解:

$3^4\times {\mathrm{397}}^1\times {\mathrm{653}}^1$

素因数の和:1062

約数の個数: 20

約数和(自身を含む): 31495332

約数和(自身を除く): 10496811

約数列:

[1, 3, 9, 27, 81, 397, 653, 1191, 1959, 3573, 5877, 10719, 17631, 32157, 52893, 259241, 777723, 2333169, 6999507, 20998521]

約数ペア:

[(1, 20998521), (3, 6999507), (9, 2333169), (27, 777723), (81, 259241), (397, 52893), (653, 32157), (1191, 17631), (1959, 10719), (3573, 5877)]