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python - How to store an integer leaded by zeros in django

I'm trying to store a number in django that looks like this:

000001

My problem is that if I type this inside an IntegerField it gets converted to "1" without the leading zeros. I've tried also with a DecimalField with the same result. How can I store the leading zeros whithout using a CharField? (I need to manipulate that number in it's integer form)

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Don't store it with the leading zeros. Format it on output instead:

(in view: value = 1)
{{ value|stringformat:"04d" }} #?displays as 0001

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