21380709

素因数分解:

$3^1\times 7^2\times {\mathrm{37}}^1\times {\mathrm{3931}}^1$

素因数の和:3985

約数の個数: 24

約数和(自身を含む): 34066848

約数和(自身を除く): 12686139

約数列:

[1, 3, 7, 21, 37, 49, 111, 147, 259, 777, 1813, 3931, 5439, 11793, 27517, 82551, 145447, 192619, 436341, 577857, 1018129, 3054387, 7126903, 21380709]

約数ペア:

[(1, 21380709), (3, 7126903), (7, 3054387), (21, 1018129), (37, 577857), (49, 436341), (111, 192619), (147, 145447), (259, 82551), (777, 27517), (1813, 11793), (3931, 5439)]