21820239

素因数分解:

$3^3\times 7^2\times {\mathrm{16493}}^1$

素因数の和:16516

約数の個数: 24

約数和(自身を含む): 37606320

約数和(自身を除く): 15786081

約数列:

[1, 3, 7, 9, 21, 27, 49, 63, 147, 189, 441, 1323, 16493, 49479, 115451, 148437, 346353, 445311, 808157, 1039059, 2424471, 3117177, 7273413, 21820239]

約数ペア:

[(1, 21820239), (3, 7273413), (7, 3117177), (9, 2424471), (21, 1039059), (27, 808157), (49, 445311), (63, 346353), (147, 148437), (189, 115451), (441, 49479), (1323, 16493)]