20000000000000000:4000

To divide \( 20,000,000,000,000,000 \) by \( 4,000 \), you can perform the calculation as follows:

1. First, rewrite the numbers in a more manageable form:

   • \( 20,000,000,000,000,000 = 2 \times 10^{16} \)
   • \( 4,000 = 4 \times 10^{3} \)

2. Now, divide: \[ \frac{2 \times 10^{16}}{4 \times 10^{3}} = \frac{2}{4} \times \frac{10^{16}}{10^{3}} = 0.5 \times 10^{13} \]

3. Finally, convert \( 0.5 \times 10^{13} \) back into standard form:

   • \( 0.5 \times 10^{13} = 5 \times 10^{12} \)

So, the result of \( 20,000,000,000,000,000 \div 4,000 \) is \( 5,000,000,000,000 \) or \( 5 \times 10^{12} \).