The table shows two numbers: the number given by the Bible, if any, and an estimate, when no biblical number is available.
Total number killed by God in the Bible - Using biblical numbers only: 2,821,364 - With estimates: 25 million
(The table has been updated to include God's killings in the Apocrypha/Deuterocanonical books. I'll be adding the missing Apocryphal stories in the next few days.)