New posts in Totient Function

Inequality $\varphi(N)>\pi(N)$?

Very elementary proof of that Euler's totient function is multiplicative

Finite-order elements of $\text{GL}_4(\mathbb{Q})$

Solving $\phi(n)=84$

Show that there is no integer n with $\phi(n)$ = 14

Euler totient function sum of divisors. Theorem 2.2 Apostol

How to show that $2730\mid n^{13}-n\;\;\forall n\in\mathbb{N}$

Prove that $\phi(n) \geq \sqrt{n}/2$

Arithmetical Functions Sum, $\sum\limits_{d|n}\sigma(d)\phi(\frac{n}{d})$ and $\sum\limits_{d|n}\tau(d)\phi(\frac{n}{d})$

Prove $n\mid \phi(2^n-1)$