19992880

素因数分解:

$2^4\times 5^1\times {\mathrm{249911}}^1$

素因数の和:249924

約数の個数: 20

約数和(自身を含む): 46483632

約数和(自身を除く): 26490752

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 249911, 499822, 999644, 1249555, 1999288, 2499110, 3998576, 4998220, 9996440, 19992880]

約数ペア:

[(1, 19992880), (2, 9996440), (4, 4998220), (5, 3998576), (8, 2499110), (10, 1999288), (16, 1249555), (20, 999644), (40, 499822), (80, 249911)]