$20 Dollars.
The serial number on a dollar bill and other currency refers to the note series, and the Federal Reserve bank that issued the note. The serial number is used to keep track of currency.
The value is more dependent on the year (series) of the bill. The serial number by itself isn't enough information.
All Australian banknotes have a serial number. For each issue of banknotes, there will be a first and last serial number. The Australian paper Fifty Dollar note issued in 1973 with the signatories Phillips/Wheeler, had a first serial number of YAA 000000. The last note printed in that series had a serial number of YAU 999999. The next series of Australian paper Fifty Dollar note issued in 1976 with the signatories Knight/Wheeler, had a first serial number of YAV 000000. The last note printed in that series had a serial number of YBX 999999. Banknotes with first and last serial numbers usually have a higher collector value.
The serial number alone isn't enough to assign value, but rather the series year and the condition. Without more information, it's assumed to be worth one dollar.
The value is determined by the series (date) and condition.
The serial number isn't really useful in giving a value. Post a new question and include information like the series (date) and condition.
You need to specify the series, the condition and if there is anything special about the serial number (for example, is it a star note? or is it a fancy serial number such as 00000000001 or something)
Please see the attached link.
A more useful bit of information to determine the bill's value is the series (date) on it, rather than the serial number. Now if it's a series 1976 or later, it's worth $2.
A serial number that low, the bill might go for around $3 if it's in decent condition.
It's worth exactly 20 dollars.
A bill's serial number rarely affects its value. Please post a new, separate question with the bill's date.