<Table> <Tr> <Th_colspan="2"> Switched at Birth (season 4) </Th> </Tr> <Tr> <Th> Starring </Th> <Td> <Ul> <Li> Vanessa Marano </Li> <Li> Katie Leclerc </Li> <Li> Constance Marie </Li> <Li> D. W. Moffett </Li> <Li> Lea Thompson </Li> <Li> Lucas Grabeel </Li> <Li> Sean Berdy </Li> </Ul> </Td> </Tr> <Tr> <Th> Country of origin </Th> <Td> United States </Td> </Tr> <Tr> <Th> No. of episodes </Th> <Td> 20 </Td> </Tr> <Tr> <Th_colspan="2"> Release </Th> </Tr> <Tr> <Th> Original network </Th> <Td> ABC Family </Td> </Tr> <Tr> <Th> Original release </Th> <Td> January 6--October 26, 2015 </Td> </Tr> <Tr> <Th_colspan="2"> Season chronology </Th> </Tr> <Tr> <Td_colspan="2"> ← Previous Season 3 Next → Season 5 </Td> </Tr> <Tr> <Td_colspan="2"> List of Switched at Birth episodes </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Switched at Birth (season 4) </Th> </Tr>

How many episodes are in season 4 of switched at birth