20643215

素因数分解:

$5^1\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{59}}^1\times {\mathrm{127}}^1$

素因数の和:239

約数の個数: 32

約数和(自身を含む): 27648000

約数和(自身を除く): 7004785

約数列:

[1, 5, 19, 29, 59, 95, 127, 145, 295, 551, 635, 1121, 1711, 2413, 2755, 3683, 5605, 7493, 8555, 12065, 18415, 32509, 37465, 69977, 142367, 162545, 217297, 349885, 711835, 1086485, 4128643, 20643215]

約数ペア:

[(1, 20643215), (5, 4128643), (19, 1086485), (29, 711835), (59, 349885), (95, 217297), (127, 162545), (145, 142367), (295, 69977), (551, 37465), (635, 32509), (1121, 18415), (1711, 12065), (2413, 8555), (2755, 7493), (3683, 5605)]