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_1449176_1 (density__inhabitants_km_2__ VARCHAR, area__km_2__ VARCHAR)
### Question:
What is the density of the common with an area of 20.4 km^2?
### Answer:
SELECT density__inhabitants_km_2__ FROM table_1449176_1 WHERE area__km_2__ = "20.4"