The NEC allows 26.
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The minimum size you can use is 3/4 conduit. The code allows for a maximum of 4 each # 6 gauge wires in a 3/4 inch pipe. You'll likely be running 3 ea # 6s, two hots and the neutral and a #10 ground wire.
50 mm or 2 inch will handle the 3/0 wires for a 200 amp service.
2 inch Rigid or IMC conduit if it's on a structure. 2 inch schedule 80 PVC conduit if it's on a wood pole.
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For new 200 amp services the conduit size should be 3 inch PVC.