257404160

素因数分解:

$2^8\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{499}}^1$

素因数の和:564

約数の個数: 144

約数和(自身を含む): 686784000

約数和(自身を除く): 429379840

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 31, 32, 40, 52, 62, 64, 65, 80, 104, 124, 128, 130, 155, 160, 208, 248, 256, 260, 310, 320, 403, 416, 496, 499, 520, 620, 640, 806, 832, 992, 998, 1040, 1240, 1280, 1612, 1664, 1984, 1996, 2015, 2080, 2480, 2495, 3224, 3328, 3968, 3992, 4030, 4160, 4960, 4990, 6448, 6487, 7936, 7984, 8060, 8320, 9920, 9980, 12896, 12974, 15469, 15968, 16120, 16640, 19840, 19960, 25792, 25948, 30938, 31936, 32240, 32435, 39680, 39920, 51584, 51896, 61876, 63872, 64480, 64870, 77345, 79840, 103168, 103792, 123752, 127744, 128960, 129740, 154690, 159680, 201097, 207584, 247504, 257920, 259480, 309380, 319360, 402194, 415168, 495008, 515840, 518960, 618760, 638720, 804388, 830336, 990016, 1005485, 1037920, 1237520, 1608776, 1660672, 1980032, 2010970, 2075840, 2475040, 3217552, 3960064, 4021940, 4151680, 4950080, 6435104, 8043880, 8303360, 9900160, 12870208, 16087760, 19800320, 25740416, 32175520, 51480832, 64351040, 128702080, 257404160]

約数ペア:

[(1, 257404160), (2, 128702080), (4, 64351040), (5, 51480832), (8, 32175520), (10, 25740416), (13, 19800320), (16, 16087760), (20, 12870208), (26, 9900160), (31, 8303360), (32, 8043880), (40, 6435104), (52, 4950080), (62, 4151680), (64, 4021940), (65, 3960064), (80, 3217552), (104, 2475040), (124, 2075840), (128, 2010970), (130, 1980032), (155, 1660672), (160, 1608776), (208, 1237520), (248, 1037920), (256, 1005485), (260, 990016), (310, 830336), (320, 804388), (403, 638720), (416, 618760), (496, 518960), (499, 515840), (520, 495008), (620, 415168), (640, 402194), (806, 319360), (832, 309380), (992, 259480), (998, 257920), (1040, 247504), (1240, 207584), (1280, 201097), (1612, 159680), (1664, 154690), (1984, 129740), (1996, 128960), (2015, 127744), (2080, 123752), (2480, 103792), (2495, 103168), (3224, 79840), (3328, 77345), (3968, 64870), (3992, 64480), (4030, 63872), (4160, 61876), (4960, 51896), (4990, 51584), (6448, 39920), (6487, 39680), (7936, 32435), (7984, 32240), (8060, 31936), (8320, 30938), (9920, 25948), (9980, 25792), (12896, 19960), (12974, 19840), (15469, 16640), (15968, 16120)]