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The deviations from the mean can be found by subtracting the mean from each data point:
10 - 20 = -10
5 - 20 = -15
15 - 20 = -5
20 - 20 = 0
40 - 20 = 20
30 - 20 = 10
The sum of the deviations is -10 + (-15) + (-5) + 0 + 20 + 10 = -10 - 15 - 5 + 20 + 10 = 30.
Therefore, the sum of the deviations is 30.