Basically, you have two options for life insurance: term or Permanent.
You could buy a permanent life insurance policy and after 20 years, stop paying your premiums or just cancel the policy.
However, a 20 year term life insurance policy will offer you much lower premiums, or a much higher amount of life insurance coverage for your money.
Why is term life cheaper? Because, permanent life insurance provides lifetime protection and builds cash value inside the policy.
Whereas, term life insurance is temporary, and not an investment, it is pure life insurance protection.
But, if you want the option of having life insurance for a period longer than 20 years you may want to add the renewability option to your term life policy. It costs more, but allows you to renew your 20 year term life plan for another 10 years when it expires.
Here's how you can learn more about 20 year fixed term insurance and compare term life insurance rates online among leading life insurance companies.