Top 20 wins apparently mean very little to the blue-ribbon CFP committee.
Most wins against current top 20 teams:
All Big 10 teams - Combined 4 (2 by Oregon, 1 by Ohio State, and 1 by Nebraska)
Georgia 3
Oregon 2
Alabama 2
Ole Miss 2
All Big 12 teams - Combined 2 (1 by BYU, 1 by Kansas State)
Ohio State 1
Notre Dame 1
Tennessee 1
BYU 1
Boise State 0
PSU 0
Indiana 0
Miami 0
Texas 0
SMU 0
Colorado 0
Most wins against current top 20 teams:
All Big 10 teams - Combined 4 (2 by Oregon, 1 by Ohio State, and 1 by Nebraska)
Georgia 3
Oregon 2
Alabama 2
Ole Miss 2
All Big 12 teams - Combined 2 (1 by BYU, 1 by Kansas State)
Ohio State 1
Notre Dame 1
Tennessee 1
BYU 1
Boise State 0
PSU 0
Indiana 0
Miami 0
Texas 0
SMU 0
Colorado 0