More fun in 2016, Part 7

Number Theory Level 2

Find ∑d∣2016ϕ(d).\sum_{d|2016}\phi(d).

Clarifications

  • This sum is taken over all 36 positive integer divisors dd of 2016.

  • ϕ(d)\phi(d) denotes Euler's totient function.

Otto Bretscher by Otto Bretscher
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