That number is down 5 million from last year when 32 million watched SK Telecom T1 defeat Royal Club at the Staples Center in Los Angeles.
Peak concurrent viewers (that's the point where most people were watching at once) was 11.2 million, up from the previous year where it was just over 8.5 million. During the finals, average online viewing time was 67 minutes as opposed to 42 minutes in 2013.
What that basically means is that this year's Worlds had a higher spike of interest at one point and that fans were inclined to watch the show around 25 minutes longer, but the overall audience was smaller.
"It's awesome to see fans enjoying Worlds as a community, " was what Riot had to say on the matter in their official statement, "whether it's with 40,000 friends cheering together in Sangam Stadium, or as a group staying up late at a local viewing party halfway across the world. We're honored by your passion and participation."
Riot will be unveiling some of its 2015 plans over the next few weeks bt if you're after some competitive LoL to watch there's the Expansion Tournament. In case you have no idea what that is, previously the North American and European League Championship Series consisted of 8 teams but are now being expanded to 10. The tournament is seeking to fill those extra spaces and will comprise teams from the Promotion Tournament, the Challenger Series playoffs and the ranked 5s ladder.