21281778

素因数分解:

$2^1\times 3^4\times 7^3\times {\mathrm{383}}^1$

素因数の和:418

約数の個数: 80

約数和(自身を含む): 55756800

約数和(自身を除く): 34475022

約数列:

[1, 2, 3, 6, 7, 9, 14, 18, 21, 27, 42, 49, 54, 63, 81, 98, 126, 147, 162, 189, 294, 343, 378, 383, 441, 567, 686, 766, 882, 1029, 1134, 1149, 1323, 2058, 2298, 2646, 2681, 3087, 3447, 3969, 5362, 6174, 6894, 7938, 8043, 9261, 10341, 16086, 18522, 18767, 20682, 24129, 27783, 31023, 37534, 48258, 55566, 56301, 62046, 72387, 112602, 131369, 144774, 168903, 217161, 262738, 337806, 394107, 434322, 506709, 788214, 1013418, 1182321, 1520127, 2364642, 3040254, 3546963, 7093926, 10640889, 21281778]

約数ペア:

[(1, 21281778), (2, 10640889), (3, 7093926), (6, 3546963), (7, 3040254), (9, 2364642), (14, 1520127), (18, 1182321), (21, 1013418), (27, 788214), (42, 506709), (49, 434322), (54, 394107), (63, 337806), (81, 262738), (98, 217161), (126, 168903), (147, 144774), (162, 131369), (189, 112602), (294, 72387), (343, 62046), (378, 56301), (383, 55566), (441, 48258), (567, 37534), (686, 31023), (766, 27783), (882, 24129), (1029, 20682), (1134, 18767), (1149, 18522), (1323, 16086), (2058, 10341), (2298, 9261), (2646, 8043), (2681, 7938), (3087, 6894), (3447, 6174), (3969, 5362)]