Numbers are infinitely dense and that means there is no such thing as a next number. Consider 14999.1 : it follows 14999 but to be next there should be no number between 14999 and 14999.1. But there are infinitely many such numbers eg 14999.01, 14999.02 and so on.
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The smallest number to round to 10000 is 5000. The largest number is 14999.
Any number from 5000 to 14999 would round to 10000.
20100 comes after 20099.
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