Jose is exactly 20 years old today, to the second. How many seconds has he lived?

630,720,000

Step-by-step explanation:

1 year consists of 365 days.

1 day has 24 hours, each hour has 60 minutes and each minute has 60 seconds.

The number of seconds in 365 days is 86,400*365 = 31,536,000 seconds.

So then if that's one year, just multiply the seconds by 20 years.

31536000*20

Jose has lived 630,720,000 seconds.