19998080

素因数分解:

$2^7\times 5^1\times {\mathrm{31247}}^1$

素因数の和:31266

約数の個数: 32

約数和(自身を含む): 47809440

約数和(自身を除く): 27811360

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640, 31247, 62494, 124988, 156235, 249976, 312470, 499952, 624940, 999904, 1249880, 1999808, 2499760, 3999616, 4999520, 9999040, 19998080]

約数ペア:

[(1, 19998080), (2, 9999040), (4, 4999520), (5, 3999616), (8, 2499760), (10, 1999808), (16, 1249880), (20, 999904), (32, 624940), (40, 499952), (64, 312470), (80, 249976), (128, 156235), (160, 124988), (320, 62494), (640, 31247)]