20555442017 has 4 divisors (see below), whose sum is σ = 22424118576. Its totient is φ = 18686765460.

The previous prime is 20555442007. The next prime is 20555442023. The reversal of 20555442017 is 71024455502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20555442017 - 2²⁸ = 20287006561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20555442007) 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, 934338263 + ... + 934338284.

It is an arithmetic number, because the mean of its divisors is an integer number (5606029644).

Almost surely, 2^20555442017 is an apocalyptic number.

It is an amenable number.

20555442017 is a deficient number, since it is larger than the sum of its proper divisors (1868676559).

20555442017 is a wasteful number, since it uses less digits than its factorization.

20555442017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1868676558.

The product of its (nonzero) digits is 56000, while the sum is 35.

Adding to 20555442017 its reverse (71024455502), we get a palindrome (91579897519).

The spelling of 20555442017 in words is "twenty billion, five hundred fifty-five million, four hundred forty-two thousand, seventeen".