The Disney+ special celebrating the 20th anniversary of “ Hannah Montana ” reached 6.3 million viewers in its first three days of streaming. Additionally, the anniversary drove a massive surge for the original Disney Channel series. Viewership of “Hannah Montana” itself was up 1,000% over the last week compared to the week before it. Despite that the series ended its run on Disney Channel in 2011, its popularity endures: Disney reports that “Hannah Montana” has been streamed for more than 500