20,000 is like the limit, Formula 1 type engine-speed. What do you propose to drive this with - a gas-turbine?L
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"Alternators can take high speeds up to 20,000 RPMs for short periods"Find the facts here:http://www.powermastermotorsports.com/power_pulleys.html
I would suspect you would overheat the bearings and cause some sort of failure if you run it at that speed for any real amount of time.
well if it is a high performance one you might get away with it for a few seconds but a standard one I think it will most likely damage it
Why would you be running your engine at 20,000 rpm? The motor would probably give out before the alternator does.