4231258 ÷ 20 
We're looking to find how many times 20 goes into 4231258.

Step 1:
If we divide 4 by 20, we get 0 and a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Grab the next digit (2) from the dividend, add it to 4, then carry on: 42 / 20

Advancing to step 2:
When dividing 42 by 20, we get 2 with a remainder of 2.
Write down 2 as next digit of the result. 
Result so far: 2.0
Deduct 40 from 42 and we're left with 2.
Grab the next digit (3) from the dividend, add it to 2, then carry on: 23 / 20

Let's proceed to step 3:
The number 20 fits into 23 1 times, leaving a remainder of 3.
Put 1 as the next digit of the answer. 
Result so far: 21.0
The remainder is 3 after subtracting 20 from 23.
Bring next digit (1) of the dividend behind the 3 and repeat the process: 31 / 20

Step 4:
31 divided by 20 is 1 with a remainder of 11.
Record the quotient 1 as the next digit in the result. 
Result so far: 211.0
Deduct 20 from 31 and we're left with 11.
Grab the next digit (2) from the dividend, add it to 11, then carry on: 112 / 20

On to step 5:
112 divided by 20 is 5 with a remainder of 12.
Use 5 as the next digit of our solution. 
Result so far: 2115.0
Subtract 100 from 112 to get 12.
Grab the next digit (5) from the dividend, add it to 12, then carry on: 125 / 20

Going ahead to step 6:
20 goes into 125 6 times with a remainder of 5.
Write down 6 as next digit of the result. 
Result so far: 21156.0
Deduct 120 from 125 and we're left with 5.
Take the next digit (8) from the dividend and append it to 5, then repeat: 58 / 20

Let's proceed to step 7:
When dividing 58 by 20, we get 2 with a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 211562.0
Subtracting 40 from 58 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 8:
The number 20 fits into 180 9 times, leaving a remainder of 0.
Use 9 as the next digit of our solution. 
Result so far: 211562.9
If we take 180 away from 180, we end up 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.
Use 0 as the next digit of our solution. 
Result so far: 211562.9
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.

Step 10:
20 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 211562.9
If we take 0 away from 0, we end up 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.

After the division, we end up with 211562.9 and a remainder of 0.0.