Omar downloaded emojis. Each emoji had a file size of 3.7 kilobytes. What is the total file size in kilobytes of 6 of these emojis?

The total file size of 6 emojis is (6 emojis * 3.7 kilobytes/emoji) = <<6*3.7=22.2>>22.2 kilobytes. Answer: \boxed{22.2}.