IRQBALANCE_BANNED_CPUS setting

Hello,
I'm hoping someone could help with the following articles:

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux_for_real_time/7/html/tuning_guide/interrupt_and_process_binding

https://access.redhat.com/solutions/3152271

First, the following setting is made in our environment that was set by the Admin before me:

IRQBALANCE_BANNED_CPUS=000fffff

This is supposed to be set for CPUs 0-19. I'm actually having a difficult time understanding if that hex setting is correct per the Admin's intention. I could not find anywhere in the articles (and in my Google'ing) on how to tell if that setting is actually working as intended. One thing I have found on the systems that have that setting is if I run 'ps -aeF' I still see what looks to be irqs' on CPUs 0-19. Based on my understanding from the articles, I would have assumed I would NOT see any irq assigned to any of the CPUs 0-19.
The other thing I am trying to do and I'm a little confused on how to set is to add CPU 27 to that setting.
If anyone can assist, I would greatly appreciate it. This is for OS release 7.9.