19979778

素因数分解:

$2^1\times 3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{37}}^1\times {\mathrm{43}}^1$

素因数の和:128

約数の個数: 128

約数和(自身を含む): 53932032

約数和(自身を除く): 33952254

約数列:

[1, 2, 3, 6, 7, 13, 14, 21, 23, 26, 37, 39, 42, 43, 46, 69, 74, 78, 86, 91, 111, 129, 138, 161, 182, 222, 258, 259, 273, 299, 301, 322, 481, 483, 518, 546, 559, 598, 602, 777, 851, 897, 903, 962, 966, 989, 1118, 1443, 1554, 1591, 1677, 1702, 1794, 1806, 1978, 2093, 2553, 2886, 2967, 3182, 3354, 3367, 3913, 4186, 4773, 5106, 5934, 5957, 6279, 6734, 6923, 7826, 9546, 10101, 11063, 11137, 11739, 11914, 12558, 12857, 13846, 17871, 20202, 20683, 20769, 22126, 22274, 23478, 25714, 33189, 33411, 35742, 36593, 38571, 41366, 41538, 62049, 66378, 66822, 73186, 77142, 77441, 89999, 109779, 124098, 144781, 154882, 179998, 219558, 232323, 256151, 269997, 289562, 434343, 464646, 475709, 512302, 539994, 768453, 868686, 951418, 1427127, 1536906, 2854254, 3329963, 6659926, 9989889, 19979778]

約数ペア:

[(1, 19979778), (2, 9989889), (3, 6659926), (6, 3329963), (7, 2854254), (13, 1536906), (14, 1427127), (21, 951418), (23, 868686), (26, 768453), (37, 539994), (39, 512302), (42, 475709), (43, 464646), (46, 434343), (69, 289562), (74, 269997), (78, 256151), (86, 232323), (91, 219558), (111, 179998), (129, 154882), (138, 144781), (161, 124098), (182, 109779), (222, 89999), (258, 77441), (259, 77142), (273, 73186), (299, 66822), (301, 66378), (322, 62049), (481, 41538), (483, 41366), (518, 38571), (546, 36593), (559, 35742), (598, 33411), (602, 33189), (777, 25714), (851, 23478), (897, 22274), (903, 22126), (962, 20769), (966, 20683), (989, 20202), (1118, 17871), (1443, 13846), (1554, 12857), (1591, 12558), (1677, 11914), (1702, 11739), (1794, 11137), (1806, 11063), (1978, 10101), (2093, 9546), (2553, 7826), (2886, 6923), (2967, 6734), (3182, 6279), (3354, 5957), (3367, 5934), (3913, 5106), (4186, 4773)]