Provide the number of international students and number of students in 2013 in university ID 20.
number of international students refers to DIVIDE(MULTIPLY(pct_international_students, num_students), 100); in 2013 refers to year = 2013
SELECT pct_international_students * num_students, num_students FROM university_year WHERE year = 2013 AND university_id = 20
database name:db_id university
country table country Cols: id dtype integer, country name dtype text, 
ranking_system table ranking_system Cols: id dtype integer, system name dtype text, 
ranking_criteria table ranking_criteria Cols: id dtype integer, ranking system id dtype integer, criteria name dtype text, 
university table university Cols: id dtype integer, country id dtype integer, university name dtype text, 
university_ranking_year table university_ranking_year Cols: university id dtype integer, ranking criteria id dtype integer, year dtype integer, score dtype integer, 
university_year table university_year Cols: university id dtype integer, year dtype integer, number of students dtype integer, student staff ratio dtype real, pct internation student dtype integer, pct female students dtype integer, 
