81660215

素因数分解:

$5^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{25639}}^1$

素因数の和:25671

約数の個数: 24

約数和(自身を含む): 122764320

約数和(自身を除く): 41104105

約数列:

[1, 5, 7, 13, 35, 49, 65, 91, 245, 455, 637, 3185, 25639, 128195, 179473, 333307, 897365, 1256311, 1666535, 2333149, 6281555, 11665745, 16332043, 81660215]

約数ペア:

[(1, 81660215), (5, 16332043), (7, 11665745), (13, 6281555), (35, 2333149), (49, 1666535), (65, 1256311), (91, 897365), (245, 333307), (455, 179473), (637, 128195), (3185, 25639)]