This is a 20x multiply. The circuit that would be the lowest parts count and have the smallest spurious output would be a simple one IC PLL circuit with a divide by 20 in the external feedback.
For this application you can use MM74HC4046 (CMOS Phase Lock Loop) **broken link removed**
Example on frequecy mutiplier based on 74HC4046 is below:
(source of this JPG unknown)