2009 $20 2 Digit Banknote

9997999 would have been a radar.

Close but no cigar.

Solid 9's would have been a great find.

Here is a breakdown of the "special numbered" notes, that you should be looking out for. All of the prices are just estimates. (The prices are given for the Journey Series notes - Which is the currency that is used on a day to day basis) If a "special number" is on an older series of banknote, then it will be worth more. All of the estimates given are for Uncirculated condition. The price will change based on condition, denomination, and prefix.

Solid Radars: The serial number consists of only 1 digit. Since the majority of Canadian notes have a run of 10,000,000 (Serial Numbers 0000001 to 9999999) - There are only 9 "Solid's" per prefix. The serial number 8888888 is worth more and will be talked about later.
Example: 1111111, 2222222, 3333333
*Note: The serial number 8888888 is worth more and will be talked about later. (See "Rotator Note" Section)

Two Digit Radars: The serial number consists of only 2 digits.
Example: 1221221, 0300030, 5115115

Three and Four Digit Radars: The serial number consists of only 3 or 4 digits. These are common notes.
Example: 1409141, 0049400, 2533352

Ladder Notes: A "Ladder Note" has a consecutive serial number. Ladder notes can be Ascending/Descending or Ascending/Descending Radars.
Example: 1234567 (Ascending), 1234321 (Ascending/Descending Radar), 9876543 (Descending)

Million Numbered Notes: A million numbered note is exactly what it sounds like. The Serial number will consist of any number followed by 6 zeros. Just like the solid radar notes, there are only 9 of these per prefix.
Example: 1000000, 2000000, 3000000

Low Serial Numbered Notes: Banknotes with a serial number that is 1000 or lower is considered to be a "Low Serial Numbered Note"
Example: 0000001, 0000050, 0001000 (Low Serial Number Radar)

Rotator Notes or "SWIMS" Note: The Serial Number on a Rotator note is the same as when you flip the note upside down. On a rotator note, the middle digit must be an 8 or 0, and the remaining digits have to be 0, 6, 8, or 9.
Example: 9000006, 8980686, 6990669

Repeater Notes: Repeater Notes have a serial number that keeps repeating itself. These can include radars.
Example: 4014014 (401 Keeps Repeating), 0199019 (0199 Keeps Repeating), 5656565 (Two Digit Radar Repeater. 56 Keeps Repeating)
Price: $80 to $170 (Two Digit Cycle)
Price: $15 to $120 (Three Digit Cycle)

No Problem,

Glad I could help.

Banknotes - Why can't a 5 be part of a Rotator?

I got a $20 bill from an ATM today with serial number 1568951, looks like it "swims" to me!

Thanks middross. Actually, I thought that 1 was allowed in these rotator notes, and that was going to be my argument as to why a 5 should also be allowed. Looking back at Banknotes post, I see that 1 isn't allowed.

I have to disagree with an 8 looking the same when rotated though. When upright, the top of the 8 is smaller than the bottom of the 8.