The Disney Channel TV series, which started in 2006 and ran for four seasons, launched Cyrus to fame when she was just 13.
Cyrus played Miley Stewart, an average teenage girl who lived a double life as a famous pop singer named Hannah Montana and who constantly tried to conceal her true identity from the public.
Her father was played by Cyrus's own father, Billy Ray Cyrus, in both the show and the 2009 film.
The Hannah Montana 20th Anniversary Special, which will stream on Disney+, will see Cyrus revisit her most memorable moments in an interview with Alex Cooper, the host of the Call Her Daddy podcast.
The special will also feature a behind-the-scenes look at Cyrus's archival collection, as well as appearances from familiar faces and surprise guests, and special musical performances by Cyrus.
Arriving at the premiere of the special at the El Capitan Theatre in Los Angeles, sporting a glittery dress bearing an image of Hannah Montana, Cyrus said: "It's such a celebration, the special really is a gift really to the fans but also for me.
"It's an amazing different perspective to be out of it but get to be a part of it in a way that I couldn't when I was so in the middle of the chaos before."
Cyrus was joined on the red carpet by some of the stars of the original series, including Jason Earles, Moises Arias, Cody Linley, Anna Maria Perez de Tagle and Shanica Knowles.
The Hannah Montana 20th Anniversary Special is streaming now on Disney+.
22°C