In 1862, the Secretary of the Treasury was assigned the task to assign the faces to go on the bills, the only requirement was the person had to be dead. No reason was given for Jackson, but it may have been for irony. Jackson distrusted paper money, and even cautioned citizens about it in his farewell speech.
Andrew Jackson is on the 20 dollar bill
Jackson
Jackson has been on the 20-dollar bill all of my lifetime and I am getting old. The $20 dollar bill buys less than a $5 bill bought when I was a boy, but I would still say they are valuable.
Andrew Jackson
Andrew Jackson
Andrew Jackson
Jackson and Grant
President Andrew Jackson is on the face of the twenty-dollar bill. President Andrew Jackson first appeared on the twenty-dollar bill in 1928.
Andrew Jackson is on every US 20 dollar bill. So no, Andrew Jackson twenties are not rare. At all.
Andrew Jackson
Yes
If you look just below the portrait, there's a caption that will tell you it's Andrew Jackson. Every U.S. bill in current circulation has an identifying caption below the pictures on both sises.