"This Is It" , a documentary depicting the late pop king Michael Jackson's rehearsal in preparation for a planned London concert grossed 20.1 million dollars in theaters across the world, figures released Thursday show.

This was generated on the first day of its release, or Wednesday in some 100 countries and regions around the world.

Among the huge sum, a total of 12.7 millions dollars came from abroad while 7.4 million dollars were generated in theaters in the United States, Hollywood.com reported. It is expected to bring more considering Jackson's popularity and lingering love from the fans at home and abroad. The feature-length documentary is expected to be the number one money earner in this year.

"This Is It" premiered Tuesday evening at Nokia Theater, Hollywood, with a red-carpet ceremony. Some 5,000 people had the chance to watch the long-expected documentary. On Wednesday it started screening to public for a limited two-week run.

Jackson was pronounced dead June 25 after he was rushed to a Los Angeles hospital. His death was classified by the Los Angeles Police Department as homicide. His personal doctor Conrad Murray has admitted he had administered powerful anesthetic propofol and another sedative to the singer, who he alleged suffered from insomnia. A criminal investigation is still inconclusive.