Google opanda iexif...
Can't be just 20k shots... That is way too little, can probably shoot that much in a year or so. Don't know the exact number, but should be at least 50k...
Don't worry too much about shutter count anyway, shutter doesn't die so easily... It will only cost $200 or so to replace it if it does die years down the road...
Just shoot and stop worrying about all these little things...