21278259

素因数分解:

$3^2\times {\mathrm{73}}^1\times {\mathrm{139}}^1\times {\mathrm{233}}^1$

素因数の和:451

約数の個数: 24

約数和(自身を含む): 31515120

約数和(自身を除く): 10236861

約数列:

[1, 3, 9, 73, 139, 219, 233, 417, 657, 699, 1251, 2097, 10147, 17009, 30441, 32387, 51027, 91323, 97161, 153081, 291483, 2364251, 7092753, 21278259]

約数ペア:

[(1, 21278259), (3, 7092753), (9, 2364251), (73, 291483), (139, 153081), (219, 97161), (233, 91323), (417, 51027), (657, 32387), (699, 30441), (1251, 17009), (2097, 10147)]