user: Question: what's the number of households with per capita income being $16,820
Columns: ['Rank', 'Place', 'County', 'Per Capita Income', 'Median House- hold Income', 'Population', 'Number of Households']
Types: ['real', 'text', 'text', 'text', 'text', 'real', 'real']
Sample row: [1.0, 'Incline Village-Crystal Bay', 'Washoe County', '$52,521', '$69,447', 9952.0, 4176.0]
SQL:

assistant: SELECT "Number of Households" FROM "Table" WHERE "Per Capita Income" = '$16,820';