21204995

素因数分解:

$5^1\times 7^2\times {\mathrm{41}}^1\times {\mathrm{2111}}^1$

素因数の和:2171

約数の個数: 24

約数和(自身を含む): 30336768

約数和(自身を除く): 9131773

約数列:

[1, 5, 7, 35, 41, 49, 205, 245, 287, 1435, 2009, 2111, 10045, 10555, 14777, 73885, 86551, 103439, 432755, 517195, 605857, 3029285, 4240999, 21204995]

約数ペア:

[(1, 21204995), (5, 4240999), (7, 3029285), (35, 605857), (41, 517195), (49, 432755), (205, 103439), (245, 86551), (287, 73885), (1435, 14777), (2009, 10555), (2111, 10045)]