20418857311 has 4 divisors (see below), whose sum is σ = 20430196624. Its totient is φ = 20407518000.

The previous prime is 20418857287. The next prime is 20418857317. The reversal of 20418857311 is 11375881402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20418857311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20418857317) 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, 5666955 + ... + 5670556.

It is an arithmetic number, because the mean of its divisors is an integer number (5107549156).

Almost surely, 2^20418857311 is an apocalyptic number.

20418857311 is a deficient number, since it is larger than the sum of its proper divisors (11339313).

20418857311 is a wasteful number, since it uses less digits than its factorization.

20418857311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11339312.

The product of its (nonzero) digits is 53760, while the sum is 40.

The spelling of 20418857311 in words is "twenty billion, four hundred eighteen million, eight hundred fifty-seven thousand, three hundred eleven".