856989

素因数分解:

$3^2\times 7^1\times {\mathrm{61}}^1\times {\mathrm{223}}^1$

素因数の和:297

約数の個数: 24

約数和(自身を含む): 1444352

約数和(自身を除く): 587363

約数列:

[1, 3, 7, 9, 21, 61, 63, 183, 223, 427, 549, 669, 1281, 1561, 2007, 3843, 4683, 13603, 14049, 40809, 95221, 122427, 285663, 856989]

約数ペア:

[(1, 856989), (3, 285663), (7, 122427), (9, 95221), (21, 40809), (61, 14049), (63, 13603), (183, 4683), (223, 3843), (427, 2007), (549, 1561), (669, 1281)]