54573 ÷ 3 = 18191 R0
Alright, let's work through the division of 54573 by 3 step by step.

Step 1:
3 goes into 5 1 times with a remainder of 2.
Write down 1 as next digit of of the result. 
Result so far: 1
Subtract 3 from 5 to get 2.
Bring next digit (4) of the dividend behind the 2 and repeat the process: 24 / 3

Step 2:
3 goes into 24 8 times with a remainder of 0.
Write down 8 as next digit of of the result. 
Result so far: 18
Subtract 24 from 24 to get 0.
Bring next digit (5) of the dividend behind the 0 and repeat the process: 5 / 3

Step 3:
3 goes into 5 1 times with a remainder of 2.
Write down 1 as next digit of of the result. 
Result so far: 181
Subtract 3 from 5 to get 2.
Bring next digit (7) of the dividend behind the 2 and repeat the process: 27 / 3

Step 4:
3 goes into 27 9 times with a remainder of 0.
Write down 9 as next digit of of the result. 
Result so far: 1819
Subtract 27 from 27 to get 0.
Bring next digit (3) of the dividend behind the 0 and repeat the process: 3 / 3

Step 5:
3 goes into 3 1 times with a remainder of 0.
Write down 1 as next digit of of the result. 
Result so far: 18191
Subtract 3 from 3 to get 0.

The final result is 18191 with a remainder of 0.