803594 ÷ 20 
The aim is to understand the frequency of 20 in 803594.

Advancing to step 1:
The number 20 fits into 8 0 times, leaving a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (0) from the dividend and append it to 8, then repeat: 80 / 20

Going ahead to step 2:
When dividing 80 by 20, we get 4 with a remainder of 0.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Subtract 80 from 80 to get 0.
Fetch the next digit (3) from the dividend, attach it to 0 and continue: 3 / 20

Let's proceed to step 3:
3 divided by 20 is 0 with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 40.0
If we take 0 away from 3, we end up with 3.
Bring next digit (5) of the dividend behind the 3 and repeat the process: 35 / 20

Moving on to step 4:
The number 20 fits into 35 1 times, leaving a remainder of 15.
The number 1 becomes the next digit in our result. 
Result so far: 401.0
If we subtract 20 from 35, we get 15.
Take the next digit (9) from the dividend and append it to 15, then repeat: 159 / 20

On to step 5:
When dividing 159 by 20, we get 7 with a remainder of 19.
Use 7 as the next digit of our solution. 
Result so far: 4017.0
If we subtract 140 from 159, we get 19.
Take the next digit (4) from the dividend and append it to 19, then repeat: 194 / 20

Step 6:
When dividing 194 by 20, we get 9 with a remainder of 14.
The number 9 becomes the next digit in our result. 
Result so far: 40179.0
Deduct 180 from 194 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 7:
20 goes into 140 7 times with a remainder of 0.
Use 7 as the next digit of our solution. 
Result so far: 40179.7
Subtract 140 from 140 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 8:
The number 20 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 40179.7
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 9:
The number 20 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 40179.7
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 40179.7, with a leftover of 0.0.