19990400

素因数分解:

$2^7\times 5^2\times {\mathrm{6247}}^1$

素因数の和:6271

約数の個数: 48

約数和(自身を含む): 49390440

約数和(自身を除く): 29400040

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 128, 160, 200, 320, 400, 640, 800, 1600, 3200, 6247, 12494, 24988, 31235, 49976, 62470, 99952, 124940, 156175, 199904, 249880, 312350, 399808, 499760, 624700, 799616, 999520, 1249400, 1999040, 2498800, 3998080, 4997600, 9995200, 19990400]

約数ペア:

[(1, 19990400), (2, 9995200), (4, 4997600), (5, 3998080), (8, 2498800), (10, 1999040), (16, 1249400), (20, 999520), (25, 799616), (32, 624700), (40, 499760), (50, 399808), (64, 312350), (80, 249880), (100, 199904), (128, 156175), (160, 124940), (200, 99952), (320, 62470), (400, 49976), (640, 31235), (800, 24988), (1600, 12494), (3200, 6247)]