20439680

素因数分解:

$2^7\times 5^1\times {\mathrm{109}}^1\times {\mathrm{293}}^1$

素因数の和:421

約数の個数: 64

約数和(自身を含む): 49480200

約数和(自身を除く): 29040520

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 109, 128, 160, 218, 293, 320, 436, 545, 586, 640, 872, 1090, 1172, 1465, 1744, 2180, 2344, 2930, 3488, 4360, 4688, 5860, 6976, 8720, 9376, 11720, 13952, 17440, 18752, 23440, 31937, 34880, 37504, 46880, 63874, 69760, 93760, 127748, 159685, 187520, 255496, 319370, 510992, 638740, 1021984, 1277480, 2043968, 2554960, 4087936, 5109920, 10219840, 20439680]

約数ペア:

[(1, 20439680), (2, 10219840), (4, 5109920), (5, 4087936), (8, 2554960), (10, 2043968), (16, 1277480), (20, 1021984), (32, 638740), (40, 510992), (64, 319370), (80, 255496), (109, 187520), (128, 159685), (160, 127748), (218, 93760), (293, 69760), (320, 63874), (436, 46880), (545, 37504), (586, 34880), (640, 31937), (872, 23440), (1090, 18752), (1172, 17440), (1465, 13952), (1744, 11720), (2180, 9376), (2344, 8720), (2930, 6976), (3488, 5860), (4360, 4688)]