What tracking number has 20 digits?

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Tags

1. #usually
2. #ending
3. #number
4. #combination
5. #tracking
6. #other
7. #alphabets
8. #digits
9. #starting
10. #exist
11. #following
12. #format
13. #alphabetic
14. #numeric
15. #characters
16. #formats
17. #common