21215439

素因数分解:

$3^4\times 7^1\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{71}}^1$

素因数の和:138

約数の個数: 80

約数和(自身を含む): 40144896

約数和(自身を除く): 18929457

約数列:

[1, 3, 7, 9, 17, 21, 27, 31, 51, 63, 71, 81, 93, 119, 153, 189, 213, 217, 279, 357, 459, 497, 527, 567, 639, 651, 837, 1071, 1207, 1377, 1491, 1581, 1917, 1953, 2201, 2511, 3213, 3621, 3689, 4473, 4743, 5751, 5859, 6603, 8449, 9639, 10863, 11067, 13419, 14229, 15407, 17577, 19809, 25347, 32589, 33201, 37417, 40257, 42687, 46221, 59427, 76041, 97767, 99603, 112251, 138663, 178281, 228123, 261919, 298809, 336753, 415989, 684369, 785757, 1010259, 1247967, 2357271, 3030777, 7071813, 21215439]

約数ペア:

[(1, 21215439), (3, 7071813), (7, 3030777), (9, 2357271), (17, 1247967), (21, 1010259), (27, 785757), (31, 684369), (51, 415989), (63, 336753), (71, 298809), (81, 261919), (93, 228123), (119, 178281), (153, 138663), (189, 112251), (213, 99603), (217, 97767), (279, 76041), (357, 59427), (459, 46221), (497, 42687), (527, 40257), (567, 37417), (639, 33201), (651, 32589), (837, 25347), (1071, 19809), (1207, 17577), (1377, 15407), (1491, 14229), (1581, 13419), (1917, 11067), (1953, 10863), (2201, 9639), (2511, 8449), (3213, 6603), (3621, 5859), (3689, 5751), (4473, 4743)]