In the NFL, after a touchdown the ball is placed on the two yard line. In college, the ball is placed at the three yard line. So it's a 19 yard kick in the NFL, 20 yard kick in College.
10 yards for the length of the endzone + 7 yards that the kicker and holder are set up behind the line of scrimmage + 2 yards, for the ball being placed on the 2 yard line(or 3 for college.