21118239

素因数分解:

$3^4\times {\mathrm{41}}^1\times {\mathrm{6359}}^1$

素因数の和:6412

約数の個数: 20

約数和(自身を含む): 32321520

約数和(自身を除く): 11203281

約数列:

[1, 3, 9, 27, 41, 81, 123, 369, 1107, 3321, 6359, 19077, 57231, 171693, 260719, 515079, 782157, 2346471, 7039413, 21118239]

約数ペア:

[(1, 21118239), (3, 7039413), (9, 2346471), (27, 782157), (41, 515079), (81, 260719), (123, 171693), (369, 57231), (1107, 19077), (3321, 6359)]