45
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Next odd number after 999 is 1001
51. Just add two to an odd number to work out the next ;)
Start by dividing 44 by 2 to get 22. Therefore, 22 + 22 = 44. If we subtract 1 from one number, and add 1 to the other number, the sum will be the same, but now using two consecutive odd numbers; ie, 21 + 23 = 44. Therefore, the smaller number is 21.
Because - the next lowest odd number is 99999 (five digits).... and the next highest is 100003.
There are 44 positive integers less than 2,010 that have an odd number of factors.