How many variation in Ives' Variations on America?

Charles Ives' "Variations on America" features a total of 20 variations based on the well-known hymn "My Country 'Tis of Thee." These variations explore a wide range of musical styles and techniques, showcasing Ives' innovative use of dissonance, counterpoint, and orchestration. The piece reflects Ives' unique ability to blend traditional American themes with avant-garde musical ideas.