20 meters is possible to get back home, the ant will wander until he cross the trail of chemicals that other ants from his colony leave behind (so they can get back home).
If you take an ant really far, it will never get back. He will try to find food and water, and he will keep looking for its home until somebody eats him.
Kind of depends on the type of ant. Here in the south we have fire ants. They have huge colonies underground that can can span a large area. You don’t see them except a mound here and there particularly after the rain. But given how long their tunnels are for one colony, 20 meters may still be home territory. If you took an ant far enough it can’t get back to its colony it will eventually just die. Won’t last long without the colony.
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