Please review the following formula's and let me know if they are
correct:

I'm trying to calculate the principal payment for $19,855,000 @ 6.25%
interest rate over 15.5 years with 1 principal payment per year.

=-PPMT(6.25%,1,15.5,19,855,000)

I'm trying to calculate the interest payment for $19,855,000 @ 6.25%
interest rate over 15.5 years with 2 interest payments per year

=-IPMT(6.25,1,15.5,$19,855,000)

I think something's missing.
Please advise.
Thanks