21027951

素因数分解:

$3^3\times 7^1\times {\mathrm{31}}^1\times {\mathrm{37}}^1\times {\mathrm{97}}^1$

素因数の和:181

約数の個数: 64

約数和(自身を含む): 38133760

約数和(自身を除く): 17105809

約数列:

[1, 3, 7, 9, 21, 27, 31, 37, 63, 93, 97, 111, 189, 217, 259, 279, 291, 333, 651, 679, 777, 837, 873, 999, 1147, 1953, 2037, 2331, 2619, 3007, 3441, 3589, 5859, 6111, 6993, 8029, 9021, 10323, 10767, 18333, 21049, 24087, 25123, 27063, 30969, 32301, 63147, 72261, 75369, 81189, 96903, 111259, 189441, 216783, 226107, 333777, 568323, 678321, 778813, 1001331, 2336439, 3003993, 7009317, 21027951]

約数ペア:

[(1, 21027951), (3, 7009317), (7, 3003993), (9, 2336439), (21, 1001331), (27, 778813), (31, 678321), (37, 568323), (63, 333777), (93, 226107), (97, 216783), (111, 189441), (189, 111259), (217, 96903), (259, 81189), (279, 75369), (291, 72261), (333, 63147), (651, 32301), (679, 30969), (777, 27063), (837, 25123), (873, 24087), (999, 21049), (1147, 18333), (1953, 10767), (2037, 10323), (2331, 9021), (2619, 8029), (3007, 6993), (3441, 6111), (3589, 5859)]