They don't really have a start; they extend indefinitely in both directions.
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Yes, the number zero. Currently, the natural numbers are normally taken to start with zero, not with one (this was not always so). The number zero has no predecessor in the set of natural numbers. In the set of integers, however, every number has a predecessor and a successor.
No. A negative number is a number below zero, not zero itself.The number zero is neither negative nor positive.
Zero is both.
Yes. Start with the decimal point, go to the right. first number is one, on the other first number is zero.
Yes. Every integer is a factor of zero. Zero is in fact the only number that can be divided by zero, so zero is also a factor. Zero has an infinite number of factors.