The phrase "How to Train Your Dragon 20" likely refers to either the 20th Anniversary Edition of the original book or the 2025 live-action film adaptation of the How to Train Your Dragon franchise.

How to Train Your Dragon 20th Anniversary Edition (Book)

• This edition celebrates 20 years of Cressida Cowell's bestselling How to Train Your Dragon book series.
• It includes the original story along with exclusive bonus content such as a brand-new short story.
• The 20th Anniversary Edition is a deluxe hardback published in 2023, commemorating two decades since the first book's release

How to Train Your Dragon (2025 Film)

• A live-action remake of the 2010 animated film, directed, written, and produced by Dean DeBlois, who also helmed the original animated trilogy.
• The film stars Mason Thames as Hiccup and Nico Parker as Astrid, with Gerard Butler reprising his role as Stoick the Vast.
• It premiered at CinemaCon on April 2, 2025, and is scheduled for U.S. release on June 13, 2025.
• The story follows Hiccup, an inventive Viking on the isle of Berk, who befriends Toothless, a Night Fury dragon, challenging the longstanding Viking-dragon conflict.
• The film features cutting-edge visual effects and was filmed with IMAX technology to create an immersive experience.
• A sequel is planned for release in 2027

If you are referring to the book, the 20th Anniversary Edition offers a special commemorative version of the original story with added content. If you mean the film, the 2025 live-action How to Train Your Dragon is a new adaptation bringing the beloved story to life with real actors and advanced effects.