20000000:600000

To convert 20,000,000 into scientific notation, we move the decimal point 6 places to the left, therefore giving us 20,000,000 = 2.0 x 10^7.

To convert 600,000 into scientific notation, we move the decimal point 5 places to the left, therefore giving us 600,000 = 6.0 x 10^5.