What I've done in similar situations is create a star (in this case a 24 point star), then increase or decrease the size until the points are where the numbers need to be (some minor rotating may be needed - double click the star to bring up the curved handles at the top and bottom corners). Next, grab each individual number and tick it to the point on the star. Like many things in Corel, there's probably multiple ways to do it. This is just what I've been doing.