19984720

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{127}}^1\times {\mathrm{281}}^1$

素因数の和:428

約数の個数: 80

約数和(自身を含む): 53710848

約数和(自身を除く): 33726128

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 80, 112, 127, 140, 254, 280, 281, 508, 560, 562, 635, 889, 1016, 1124, 1270, 1405, 1778, 1967, 2032, 2248, 2540, 2810, 3556, 3934, 4445, 4496, 5080, 5620, 7112, 7868, 8890, 9835, 10160, 11240, 14224, 15736, 17780, 19670, 22480, 31472, 35560, 35687, 39340, 71120, 71374, 78680, 142748, 157360, 178435, 249809, 285496, 356870, 499618, 570992, 713740, 999236, 1249045, 1427480, 1998472, 2498090, 2854960, 3996944, 4996180, 9992360, 19984720]

約数ペア:

[(1, 19984720), (2, 9992360), (4, 4996180), (5, 3996944), (7, 2854960), (8, 2498090), (10, 1998472), (14, 1427480), (16, 1249045), (20, 999236), (28, 713740), (35, 570992), (40, 499618), (56, 356870), (70, 285496), (80, 249809), (112, 178435), (127, 157360), (140, 142748), (254, 78680), (280, 71374), (281, 71120), (508, 39340), (560, 35687), (562, 35560), (635, 31472), (889, 22480), (1016, 19670), (1124, 17780), (1270, 15736), (1405, 14224), (1778, 11240), (1967, 10160), (2032, 9835), (2248, 8890), (2540, 7868), (2810, 7112), (3556, 5620), (3934, 5080), (4445, 4496)]