I never liked magic numbers because it doesn't really tell you what a team needs to do to clinch.  It always seems to sound harder that it is. Here's what I mean:

At the time of this post, Angels are 71-43.  162-114 games played = 48 games left. The Angels are currently 11.5 games ahead so that means that 48-11 = 37 wins guarantees an Angel post-season.

What's 37 wins add up to?  Well 37/48 = .771 winning percentage.  I don't think such a high winning percentage has been achieved over a 48 game span since Honas Wagner was playing and maybe even before that. So 37 doesn't mean much because it depends on what other teams are doing.

After most teams had played 48 games this year the highest winning percentage in the league was .612.  So assume the Rangers get hot and post a .612 WP from here on out.  That .612*48 ~ 30 wins.  So in that context, the Angels need to only post 30-11 = 19 wins => 19/48 ~ .396 WP to clinch

Not good enough?  Let's say Texas goes hog wild and posts a .677 WP.  That ~33 wins requiring 22 Angel victories to clinch or a .458 WP.

My pythagorean magic number is 22.

And for those playing at home, in 1995 the Angels went .355 in the last 31 games of the 145 games season while the Aquamen when .677 WP. Fewer games left required a poorer performance.

In summary, Keep the motor warm and play it one game at time baby!