The formula for the sum of the interior angles of a polygon is (n-2) \times 180, where n is the number of sides of the polygon. Therefore, we can set up the equation (n-2) x 180 = 1980 and solve for n.

(n-2) x 180 = 1980

n-2 = 11

n = 13

Therefore, the polygon has 13 sides.