jmc

We can think of 1000 as $20\times 50$. The factors of 50 are 1, 2, 5, 10, 25 and 50. If we multiply each of these 6 factors of 50 by 20, we will get the six ($\boxed{6}$) factors of 1000 that can be divided evenly by 20. They are 20, 40, 100, 200, 500 and 1000.