21157895

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{37}}^2\times {\mathrm{281}}^1$

素因数の和:371

約数の個数: 24

約数和(自身を含む): 28567728

約数和(自身を除く): 7409833

約数列:

[1, 5, 11, 37, 55, 185, 281, 407, 1369, 1405, 2035, 3091, 6845, 10397, 15059, 15455, 51985, 75295, 114367, 384689, 571835, 1923445, 4231579, 21157895]

約数ペア:

[(1, 21157895), (5, 4231579), (11, 1923445), (37, 571835), (55, 384689), (185, 114367), (281, 75295), (407, 51985), (1369, 15455), (1405, 15059), (2035, 10397), (3091, 6845)]