Armor Class: A field of divine energy encompasses a deity’s body, granting it a divine Armor Class bonus equal to its divine rank. This bonus stacks with all other Armor Class bonuses and is effective against touch attacks and incorporeal touch attacks.
Most deities (all those with 20 outsider Hit Dice) have a natural armor bonus of their divine rank +13. All deities also have a deflection bonus to their AC equal to their Charisma bonus (if any).
Deities who aren’t outsiders have their normal natural armor bonus + their divine rank.
Many deities have other Armor Class bonuses as noted in their individual descriptions.