21309155

素因数分解:

$5^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{103}}^1\times {\mathrm{257}}^1$

素因数の和:395

約数の個数: 32

約数和(自身を含む): 30910464

約数和(自身を除く): 9601309

約数列:

[1, 5, 7, 23, 35, 103, 115, 161, 257, 515, 721, 805, 1285, 1799, 2369, 3605, 5911, 8995, 11845, 16583, 26471, 29555, 41377, 82915, 132355, 185297, 206885, 608833, 926485, 3044165, 4261831, 21309155]

約数ペア:

[(1, 21309155), (5, 4261831), (7, 3044165), (23, 926485), (35, 608833), (103, 206885), (115, 185297), (161, 132355), (257, 82915), (515, 41377), (721, 29555), (805, 26471), (1285, 16583), (1799, 11845), (2369, 8995), (3605, 5911)]