The Aero A.20 was developed in parallel with the A.18 in order to comply with a requeriment made by the Czech MNO (Ministerstvo Národny Obrany - Ministry of Defence) and get a contract.
It was powered by an Skoda-built 310hp Hispano-Suiza 8Fb engine. It was longer and heavier than the A.18 and also flew for the first time in 1923.
Regarding the strutcure of the fuselage it was identical to the A.18 and was also armed with a pair of synchronised 7,92mm Vickers Machine-Guns. In spite of its more powerful engine, it didn't perform well at the trials and was surpassed by the A.18, so the project was abandoned and it never went beyond the prototype stage.
Sources:
1.https://en.wikipedia.org/wiki/Aero_A.20
2. The Complete Book of Fighters
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