CoRoT-20 is a Sun-like G-type star (about 1.14 solar masses, 5,880 K), 844 light-years from Earth. CoRoT-20 b is a 4.30-Jupiter-mass companion, with an orbital period of 9.2 days, at 0.090 AU from its star, on an eccentric orbit (e ≈ 0.59), discovered in 2011 via transit. CoRoT-20 c is a 17.0-Jupiter-mass companion, with an orbital period of 4.59 years, at 2.900 AU from its star, on an eccentric orbit (e ≈ 0.60), discovered in 2018 via radial velocity. Mutual gravitational tugs between the planets can slowly reshape their orbits, preserving clues to the system's assembly.