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_64744 ( "Rank" text, "Province" text, "Population (2011)" real, "Percentage" real, "Population Estimate (2013)" real )

### Question ###
What is the lowest 2013 population estimate of south africa, which has a percentage greater than 19.8 and a 2011 population greater than 51,770,561?

### Accurate SQL ###

SELECT MIN("Population Estimate (2013)") FROM table_64744 WHERE "Percentage" > '19.8' AND "Province" = 'south africa' AND "Population (2011)" > '51,770,561'