20391021

素因数分解:

$3^4\times 7^1\times {\mathrm{35963}}^1$

素因数の和:35982

約数の個数: 20

約数和(自身を含む): 34813152

約数和(自身を除く): 14422131

約数列:

[1, 3, 7, 9, 21, 27, 63, 81, 189, 567, 35963, 107889, 251741, 323667, 755223, 971001, 2265669, 2913003, 6797007, 20391021]

約数ペア:

[(1, 20391021), (3, 6797007), (7, 2913003), (9, 2265669), (21, 971001), (27, 755223), (63, 323667), (81, 251741), (189, 107889), (567, 35963)]