less than
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Yes, -21 < -20
34+21 = 55 and 70-21 = 55
There are infinitely many numbers less than -20 but greater than -21 (it's a long explanation), with a few examples being -20.11111111, -20.5, and -6.5(2143/22)^0.25.
3 composite numbers, 21, 22, and 24, are greater than 20 but less than 25.
There are 7 composite numbers greater than 20 and less than 30:21, 22, 24, 25, 26, 27, 28