Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_73 (bronze INTEGER, nation VARCHAR, total VARCHAR)
### Question:
What is the highest Bronze, when Nation is "South Africa", and when Total is less than 20?
### Answer:
SELECT MAX(bronze) FROM table_name_73 WHERE nation = "south africa" AND total < 20