The only odd deficient-perfect number with four distinct prime divisors is 3^2 times 7^2 times 11^2 times 13^2.
Kishore, Odd integers n with five distinct prime factors for which 2 − 10− 12 < σ (n)/n < 2 + 10 − 12, Math
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On odd deficient-perfect numbers with four distinct prime divisors
The only odd deficient-perfect number with four distinct prime divisors is 3^2 times 7^2 times 11^2 times 13^2.