Cave 20 is a monastery hall (16.2 × 17.91 m) from the 5th century. Its construction, states Spink, was started in the 460s by king Upendragupta, with his expressed desire "to make the great tree of religious merit grow". The work on Cave 20 was pursued in parallel with other caves. Cave 20 has exquisite detailing, states Spink, but it was relatively lower on priority than Caves 17 and 19. The work on Cave 20 was intermittently stopped and then continued in the following decade.