19989040

素因数分解:

$2^4\times 5^1\times {\mathrm{249863}}^1$

素因数の和:249876

約数の個数: 20

約数和(自身を含む): 46474704

約数和(自身を除く): 26485664

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 249863, 499726, 999452, 1249315, 1998904, 2498630, 3997808, 4997260, 9994520, 19989040]

約数ペア:

[(1, 19989040), (2, 9994520), (4, 4997260), (5, 3997808), (8, 2498630), (10, 1998904), (16, 1249315), (20, 999452), (40, 499726), (80, 249863)]