20455617 has 16 divisors (see below), whose sum is σ = 33568640. Its totient is φ = 10789632.

The previous prime is 20455601. The next prime is 20455627. The reversal of 20455617 is 71655402.

It is not a de Polignac number, because 20455617 - 2⁴ = 20455601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20455627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37192 + ... + 37737.

It is an arithmetic number, because the mean of its divisors is an integer number (2098040).

Almost surely, 2^20455617 is an apocalyptic number.

It is an amenable number.

20455617 is a deficient number, since it is larger than the sum of its proper divisors (13113023).

20455617 is a wasteful number, since it uses less digits than its factorization.

20455617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74952.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 20455617 is about 4522.7886309223. The cubic root of 20455617 is about 273.4875293297.

The spelling of 20455617 in words is "twenty million, four hundred fifty-five thousand, six hundred seventeen".