21288687

素因数分解:

$3^1\times 7^2\times {\mathrm{97}}^1\times {\mathrm{1493}}^1$

素因数の和:1607

約数の個数: 24

約数和(自身を含む): 33381936

約数和(自身を除く): 12093249

約数列:

[1, 3, 7, 21, 49, 97, 147, 291, 679, 1493, 2037, 4479, 4753, 10451, 14259, 31353, 73157, 144821, 219471, 434463, 1013747, 3041241, 7096229, 21288687]

約数ペア:

[(1, 21288687), (3, 7096229), (7, 3041241), (21, 1013747), (49, 434463), (97, 219471), (147, 144821), (291, 73157), (679, 31353), (1493, 14259), (2037, 10451), (4479, 4753)]