What is 20 seconds in megaseconds?

Answer 1

The Mega- prefix means a million (1,000,000 = 10^6)

→ 1 Ms = 1,000,000 s

→ 20 s = 20 ÷ 1,000,000 Mg = 0.00002 Ms = 2 × 10^-5 Ms.

Answer 2

"Mega" means "times one million", so to convert seconds to megaseconds you would divide by a million.