Jelly, 7 bytes
ÆḞÆDÆḞS
Explanation:
ÆḞÆDÆḞS Main link (Arguments: z)
ÆḞ zth Fibonacci number's
ÆD divisors'
ÆḞ Fibonacci numbers'
S sum
Erik the Outgolfer
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Explanation:
ÆḞÆDÆḞS Main link (Arguments: z)
ÆḞ zth Fibonacci number's
ÆD divisors'
ÆḞ Fibonacci numbers'
S sum