I don't know, but if it were me, I would take the 5 minutes and make the 20 circles.
Ok, it only took 1.5 minutes.
1. Make a Plane with the Length and Width equal to the diameter of the largest circle, with 40 Length and Width segments.
2. Turn on 2.5D Snaps on Vertex.
3. Start at the center vertex and create the 20 circles, one after the other: first click in the center of the Plane, second click on the horizontal or vertical line going away from the center.
![](http://area.autodesk.com/userdata/forum/2/299_SlSQN7H7uG8PxqWpD8Eq.jpg)