Jack it up and see?
Hard to say without seeing it, but my guess would be: bent control arm/torn control arm bushing, damaged sway bar link, damaged tie rod end, bent wheel and a screwed up tire. 20mph is quite fast to hit a curb dead on; probably gonna need to replace everything I listed + an alignment.
That said, don't just start replacing parts; either take a look at it, or if you don't know what you're looking at, have someone that does do it.
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