Unless you need better than 0.5% frequency accuracy, you can use a 3-terminal ceramic resonator instead, such as http://uk.farnell.com/abracon/awscr-16-00mtd-t/ceramic-resonator-16mhz-smd/dp/2101362?in_merch=New%20Products. These have the caps built in.
If you do use a crystal, the 2 caps are in series as seen by the resonator. So 2x22pf gives 11pF, and when you add the stray capacitance and mcu pin capacitance you will have close to 18pF.