Step 1: Divide the number into separate digits:
02280 => 0 2 2 8 0
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
0 to 2 = 2
2 to 2 = 0
2 to 8 = 6
8 to 0 = 8
0 to 0 = 0
Step 3: Combine the filters to a string:
2 0 6 8 0 = 20680