21057960

素因数分解:

$2^3\times 3^1\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{43}}^1\times {\mathrm{53}}^1$

素因数の和:128

約数の個数: 256

約数和(自身を含む): 82114560

約数和(自身を除く): 61056600

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 14, 15, 20, 21, 22, 24, 28, 30, 33, 35, 40, 42, 43, 44, 53, 55, 56, 60, 66, 70, 77, 84, 86, 88, 105, 106, 110, 120, 129, 132, 140, 154, 159, 165, 168, 172, 210, 212, 215, 220, 231, 258, 264, 265, 280, 301, 308, 318, 330, 344, 371, 385, 420, 424, 430, 440, 462, 473, 516, 530, 583, 602, 616, 636, 645, 660, 742, 770, 795, 840, 860, 903, 924, 946, 1032, 1060, 1113, 1155, 1166, 1204, 1272, 1290, 1320, 1419, 1484, 1505, 1540, 1590, 1720, 1749, 1806, 1848, 1855, 1892, 2120, 2226, 2279, 2310, 2332, 2365, 2408, 2580, 2838, 2915, 2968, 3010, 3080, 3180, 3311, 3498, 3612, 3710, 3784, 4081, 4452, 4515, 4558, 4620, 4664, 4730, 5160, 5565, 5676, 5830, 6020, 6360, 6622, 6837, 6996, 7095, 7224, 7420, 8162, 8745, 8904, 9030, 9116, 9240, 9460, 9933, 11130, 11352, 11395, 11660, 12040, 12243, 13244, 13674, 13992, 14190, 14840, 15953, 16324, 16555, 17490, 18060, 18232, 18920, 19866, 20405, 22260, 22790, 23320, 24486, 25069, 26488, 27348, 28380, 31906, 32648, 33110, 34185, 34980, 36120, 39732, 40810, 44520, 45580, 47859, 48972, 49665, 50138, 54696, 56760, 61215, 63812, 66220, 68370, 69960, 75207, 79464, 79765, 81620, 91160, 95718, 97944, 99330, 100276, 122430, 125345, 127624, 132440, 136740, 150414, 159530, 163240, 175483, 191436, 198660, 200552, 239295, 244860, 250690, 273480, 300828, 319060, 350966, 376035, 382872, 397320, 478590, 489720, 501380, 526449, 601656, 638120, 701932, 752070, 877415, 957180, 1002760, 1052898, 1403864, 1504140, 1754830, 1914360, 2105796, 2632245, 3008280, 3509660, 4211592, 5264490, 7019320, 10528980, 21057960]

約数ペア:

[(1, 21057960), (2, 10528980), (3, 7019320), (4, 5264490), (5, 4211592), (6, 3509660), (7, 3008280), (8, 2632245), (10, 2105796), (11, 1914360), (12, 1754830), (14, 1504140), (15, 1403864), (20, 1052898), (21, 1002760), (22, 957180), (24, 877415), (28, 752070), (30, 701932), (33, 638120), (35, 601656), (40, 526449), (42, 501380), (43, 489720), (44, 478590), (53, 397320), (55, 382872), (56, 376035), (60, 350966), (66, 319060), (70, 300828), (77, 273480), (84, 250690), (86, 244860), (88, 239295), (105, 200552), (106, 198660), (110, 191436), (120, 175483), (129, 163240), (132, 159530), (140, 150414), (154, 136740), (159, 132440), (165, 127624), (168, 125345), (172, 122430), (210, 100276), (212, 99330), (215, 97944), (220, 95718), (231, 91160), (258, 81620), (264, 79765), (265, 79464), (280, 75207), (301, 69960), (308, 68370), (318, 66220), (330, 63812), (344, 61215), (371, 56760), (385, 54696), (420, 50138), (424, 49665), (430, 48972), (440, 47859), (462, 45580), (473, 44520), (516, 40810), (530, 39732), (583, 36120), (602, 34980), (616, 34185), (636, 33110), (645, 32648), (660, 31906), (742, 28380), (770, 27348), (795, 26488), (840, 25069), (860, 24486), (903, 23320), (924, 22790), (946, 22260), (1032, 20405), (1060, 19866), (1113, 18920), (1155, 18232), (1166, 18060), (1204, 17490), (1272, 16555), (1290, 16324), (1320, 15953), (1419, 14840), (1484, 14190), (1505, 13992), (1540, 13674), (1590, 13244), (1720, 12243), (1749, 12040), (1806, 11660), (1848, 11395), (1855, 11352), (1892, 11130), (2120, 9933), (2226, 9460), (2279, 9240), (2310, 9116), (2332, 9030), (2365, 8904), (2408, 8745), (2580, 8162), (2838, 7420), (2915, 7224), (2968, 7095), (3010, 6996), (3080, 6837), (3180, 6622), (3311, 6360), (3498, 6020), (3612, 5830), (3710, 5676), (3784, 5565), (4081, 5160), (4452, 4730), (4515, 4664), (4558, 4620)]