Infinitely many.
1 + 1 + 1 + 19
.1 + .1 + .1 + 21.7
.01 + .01 +.01 + 21.97
And so on. And all these are with three of the numbers being the same.
There are also combinations where some numbers are irrational -infinite, non recurring decimals.
Then there are combinations with some of the numbers being negative.
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22
22 of them.
There are none. The only four consecutive integers totaling 90 are 21, 22, 23 and 24.
22 - 4 = 18 = 9 x 22 with 4 remaining
No it's not. 22 is an even number.