See the map:
http://www.au.af.mil/au/awc/awcgate/gabrmetz/map3a.gif
No, it had 20 provinces.
20.
The rulership of the Persian king of the 20 provinces with Persian governors.
Satrapies.
The king and his council, and the 20 governors who controlled the provinces of the Persian Empire.
Twenty Satrapies (Provinces).
The territories of the Persian Empire were called satrapis.
Twenty provinces (Satrapies).
Satrapies (Provinces).
Satrap
King Darius the Great.
One of the nobles of the Persian tribe. There were 20 provinces (satrapies) and 20 governors (satraps)