<Tr> <Th> Website </Th> <Td> premierleague.com </Td> </Tr> <Tr> <Td_colspan="2"> 2017--18 Premier League </Td> </Tr> <P> The Premier League is an English professional league for men's association football clubs . At the top of the English football league system, it is the country's primary football competition . Contested by 20 clubs, it operates on a system of promotion and relegation with the English Football League (EFL; known as "The Football League" before 2016--17). Welsh clubs that compete in the English football league system can also qualify . </P> <P> The Premier League is a corporation in which the 20 member clubs act as shareholders . Seasons run from August to May . Teams play 38 matches each (playing each team in the league twice, home and away), totalling 380 matches in the season . Most games are played on Saturday and Sunday afternoons; others during weekday evenings . It is colloquially known as the Premiership and outside the UK it is commonly referred to as the English Premier League (EPL). </P>

How many teams in the english premier league