20055617 has 4 divisors (see below), whose sum is σ = 20747220. Its totient is φ = 19364016.

The previous prime is 20055611. The next prime is 20055619. The reversal of 20055617 is 71655002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71655002 = 2 ⋅35827501.

It can be written as a sum of positive squares in 2 ways, for example, as 5340721 + 14714896 = 2311^2 + 3836^2 .

It is a cyclic number.

It is not a de Polignac number, because 20055617 - 2²⁰ = 19007041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20055611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345758 + ... + 345815.

It is an arithmetic number, because the mean of its divisors is an integer number (5186805).

Almost surely, 2^20055617 is an apocalyptic number.

It is an amenable number.

20055617 is a deficient number, since it is larger than the sum of its proper divisors (691603).

20055617 is an equidigital number, since it uses as much as digits as its factorization.

20055617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691602.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 20055617 is about 4478.3498076859. The cubic root of 20055617 is about 271.6931417275.

The spelling of 20055617 in words is "twenty million, fifty-five thousand, six hundred seventeen".