21240471

素因数分解:

$3^1\times 7^2\times {\mathrm{131}}^1\times {\mathrm{1103}}^1$

素因数の和:1251

約数の個数: 24

約数和(自身を含む): 33225984

約数和(自身を除く): 11985513

約数列:

[1, 3, 7, 21, 49, 131, 147, 393, 917, 1103, 2751, 3309, 6419, 7721, 19257, 23163, 54047, 144493, 162141, 433479, 1011451, 3034353, 7080157, 21240471]

約数ペア:

[(1, 21240471), (3, 7080157), (7, 3034353), (21, 1011451), (49, 433479), (131, 162141), (147, 144493), (393, 54047), (917, 23163), (1103, 19257), (2751, 7721), (3309, 6419)]