The semi-major axis of Uranus's orbit about the sun is 19.18 Astronomical Units (A.U.) or roughly 4.5 billion km.
Uranus (without rings) has a diameter of roughly 32,000 miles (51,000 km) at the equator.
Clear, F330W (U), F475W (g), F606W (V), F814W (I)
NASA, ESA, and M. Showalter (SETI Institute)