Step 1: Divide the number into separate digits:
41724 => 4 1 7 2 4
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
4 to 1 = 3
1 to 7 = 6
7 to 2 = 5
2 to 4 = 2
4 to 4 = 0
Step 3: Combine the filters to a string:
3 6 5 2 0 = 36520