54.
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23 + 31 = 54
Add up its proper factors. If that sum is less than 54, it's deficient.
6(5 + 9) = (6 x 5) + (6 x 9) = 6 x 14 = 84
1, 2, 3, 4, 6, 9, 12, 18, 27, 36, 54, 108. (sum = 280)
9 and 9018 and 8127 and 7236 and 6345 and 54