* Wheel offset: The offset of the 20-inch rim must be carefully selected to prevent rubbing. This will require research specific to your Impala's year and model.
* Tire size: Even if the rim fits, you'll need to choose a tire with the correct diameter to avoid speedometer inaccuracies and potential rubbing issues. A 20-inch rim will likely require a tire with a lower profile, potentially impacting the ride quality.
* Brake caliper clearance: 20-inch wheels might not clear the brake calipers, requiring different brake components.
In short, while *technically possible* with extensive modifications and research, it's not a straightforward "yes." It's highly recommended to consult with a tire and wheel specialist or a reputable automotive modification shop before purchasing 20-inch rims for your 2000 Chevy Impala. They can help determine compatibility and suggest appropriate modifications, if any are even feasible.