Claim: There are 21 episodes in season four of The Real Housewives of Potomac and episode 20 had the most viewers.
Evidence: 21 20 1.18 1.16 0.96 1.11 0.89 1.04 0.91 1.07 0.96 1.15 1.07 1.02 1.07 1.10 1.04 1.09 1.01 0.90 1.17 1.12 1.11