256336640

素因数分解:

$2^8\times 5^1\times 7^2\times {\mathrm{61}}^1\times {\mathrm{67}}^1$

素因数の和:163

約数の個数: 216

約数和(自身を含む): 736796592

約数和(自身を除く): 480459952

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 32, 35, 40, 49, 56, 61, 64, 67, 70, 80, 98, 112, 122, 128, 134, 140, 160, 196, 224, 244, 245, 256, 268, 280, 305, 320, 335, 392, 427, 448, 469, 488, 490, 536, 560, 610, 640, 670, 784, 854, 896, 938, 976, 980, 1072, 1120, 1220, 1280, 1340, 1568, 1708, 1792, 1876, 1952, 1960, 2135, 2144, 2240, 2345, 2440, 2680, 2989, 3136, 3283, 3416, 3752, 3904, 3920, 4087, 4270, 4288, 4480, 4690, 4880, 5360, 5978, 6272, 6566, 6832, 7504, 7808, 7840, 8174, 8540, 8576, 8960, 9380, 9760, 10720, 11956, 12544, 13132, 13664, 14945, 15008, 15616, 15680, 16348, 16415, 17080, 17152, 18760, 19520, 20435, 21440, 23912, 26264, 27328, 28609, 29890, 30016, 31360, 32696, 32830, 34160, 37520, 39040, 40870, 42880, 47824, 52528, 54656, 57218, 59780, 60032, 62720, 65392, 65660, 68320, 75040, 78080, 81740, 85760, 95648, 105056, 109312, 114436, 119560, 120064, 130784, 131320, 136640, 143045, 150080, 163480, 191296, 200263, 210112, 228872, 239120, 261568, 262640, 273280, 286090, 300160, 326960, 382592, 400526, 420224, 457744, 478240, 523136, 525280, 546560, 572180, 600320, 653920, 765184, 801052, 840448, 915488, 956480, 1001315, 1046272, 1050560, 1144360, 1307840, 1602104, 1830976, 1912960, 2002630, 2101120, 2288720, 2615680, 3204208, 3661952, 3825920, 4005260, 4202240, 4577440, 5231360, 6408416, 7323904, 8010520, 9154880, 12816832, 16021040, 18309760, 25633664, 32042080, 36619520, 51267328, 64084160, 128168320, 256336640]

約数ペア:

[(1, 256336640), (2, 128168320), (4, 64084160), (5, 51267328), (7, 36619520), (8, 32042080), (10, 25633664), (14, 18309760), (16, 16021040), (20, 12816832), (28, 9154880), (32, 8010520), (35, 7323904), (40, 6408416), (49, 5231360), (56, 4577440), (61, 4202240), (64, 4005260), (67, 3825920), (70, 3661952), (80, 3204208), (98, 2615680), (112, 2288720), (122, 2101120), (128, 2002630), (134, 1912960), (140, 1830976), (160, 1602104), (196, 1307840), (224, 1144360), (244, 1050560), (245, 1046272), (256, 1001315), (268, 956480), (280, 915488), (305, 840448), (320, 801052), (335, 765184), (392, 653920), (427, 600320), (448, 572180), (469, 546560), (488, 525280), (490, 523136), (536, 478240), (560, 457744), (610, 420224), (640, 400526), (670, 382592), (784, 326960), (854, 300160), (896, 286090), (938, 273280), (976, 262640), (980, 261568), (1072, 239120), (1120, 228872), (1220, 210112), (1280, 200263), (1340, 191296), (1568, 163480), (1708, 150080), (1792, 143045), (1876, 136640), (1952, 131320), (1960, 130784), (2135, 120064), (2144, 119560), (2240, 114436), (2345, 109312), (2440, 105056), (2680, 95648), (2989, 85760), (3136, 81740), (3283, 78080), (3416, 75040), (3752, 68320), (3904, 65660), (3920, 65392), (4087, 62720), (4270, 60032), (4288, 59780), (4480, 57218), (4690, 54656), (4880, 52528), (5360, 47824), (5978, 42880), (6272, 40870), (6566, 39040), (6832, 37520), (7504, 34160), (7808, 32830), (7840, 32696), (8174, 31360), (8540, 30016), (8576, 29890), (8960, 28609), (9380, 27328), (9760, 26264), (10720, 23912), (11956, 21440), (12544, 20435), (13132, 19520), (13664, 18760), (14945, 17152), (15008, 17080), (15616, 16415), (15680, 16348)]