21300279

素因数分解:

$3^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{173}}^1$

素因数の和:248

約数の個数: 64

約数和(自身を含む): 39287808

約数和(自身を除く): 17987529

約数列:

[1, 3, 7, 11, 13, 21, 33, 39, 41, 77, 91, 123, 143, 173, 231, 273, 287, 429, 451, 519, 533, 861, 1001, 1211, 1353, 1599, 1903, 2249, 3003, 3157, 3633, 3731, 5709, 5863, 6747, 7093, 9471, 11193, 13321, 15743, 17589, 21279, 24739, 39963, 41041, 47229, 49651, 74217, 78023, 92209, 123123, 148953, 173173, 234069, 276627, 519519, 546161, 645463, 1014299, 1638483, 1936389, 3042897, 7100093, 21300279]

約数ペア:

[(1, 21300279), (3, 7100093), (7, 3042897), (11, 1936389), (13, 1638483), (21, 1014299), (33, 645463), (39, 546161), (41, 519519), (77, 276627), (91, 234069), (123, 173173), (143, 148953), (173, 123123), (231, 92209), (273, 78023), (287, 74217), (429, 49651), (451, 47229), (519, 41041), (533, 39963), (861, 24739), (1001, 21279), (1211, 17589), (1353, 15743), (1599, 13321), (1903, 11193), (2249, 9471), (3003, 7093), (3157, 6747), (3633, 5863), (3731, 5709)]