When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

Fate has decided that you will only be pleased to meet me when you need me

Maybe that is why, when I am working, I start working

However annoying I may be to the regulars, the little ones are always inspired

I will always be waiting if you try to reach me

How many of you can guess my name, let me see

How can you take 2 from 5 and leave 4?

If you say my name, I will no longer exist. What am I?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

If a wheel has 54 spokes, how many spaces are there between the spokes?

Can you spot what's wrong with the following sentence?

PETER WAS ANGRY AT
HIMSELF BECAUSE HE
ACCIDENTALLY LEFT THE
THE KEYS TO HIS CAR
AT HIS FRIEND'S HOUSE.

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

I know a nine-letter word having only one vowel.
Do you ?