How Many Piano Sonatas Did Schubert Compose?

How Many Piano Sonatas Did Schubert Compose? During a career lasting less than 20 years, Franz Schubert (1797-1828) produced a torrent of work, including operas and symphonies; 600 songs; overtures and masses; string quartets, quintets and an octet; 20 piano sonatas; and some 50 choral works. How many piano sonatas did Schubert? During a career