21515767

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{31}}^1\times {\mathrm{263}}^1$

素因数の和:343

約数の個数: 32

約数和(自身を含む): 28385280

約数和(自身を除く): 6869513

約数列:

[1, 7, 13, 29, 31, 91, 203, 217, 263, 377, 403, 899, 1841, 2639, 2821, 3419, 6293, 7627, 8153, 11687, 23933, 53389, 57071, 81809, 99151, 105989, 236437, 694057, 741923, 1655059, 3073681, 21515767]

約数ペア:

[(1, 21515767), (7, 3073681), (13, 1655059), (29, 741923), (31, 694057), (91, 236437), (203, 105989), (217, 99151), (263, 81809), (377, 57071), (403, 53389), (899, 23933), (1841, 11687), (2639, 8153), (2821, 7627), (3419, 6293)]