21028915

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{449}}^1$

素因数の和:519

約数の個数: 32

約数和(自身を含む): 29160000

約数和(自身を除く): 8131085

約数列:

[1, 5, 17, 19, 29, 85, 95, 145, 323, 449, 493, 551, 1615, 2245, 2465, 2755, 7633, 8531, 9367, 13021, 38165, 42655, 46835, 65105, 145027, 221357, 247399, 725135, 1106785, 1236995, 4205783, 21028915]

約数ペア:

[(1, 21028915), (5, 4205783), (17, 1236995), (19, 1106785), (29, 725135), (85, 247399), (95, 221357), (145, 145027), (323, 65105), (449, 46835), (493, 42655), (551, 38165), (1615, 13021), (2245, 9367), (2465, 8531), (2755, 7633)]