Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_20639 ( "Danish name" text, "English name" text, "Seat of administration" text, "Largest city" text, "Population (January 1, 2008)" real, "Area (km\u00b2)" real, "Pop. density (per km\u00b2)" text )

### Question ###
What is the population density of the Capital Region of Denmark?

### Accurate SQL ###

SELECT "Pop. density (per km\u00b2)" FROM table_20639 WHERE "English name" = 'Capital Region of Denmark'