18920933857 has 8 divisors (see below), whose sum is σ = 21625088832. Its totient is φ = 16217070000.

The previous prime is 18920933813. The next prime is 18920933873. The reversal of 18920933857 is 75833902981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18920933857 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18920933798 and 18920933807.

It is not an unprimeable number, because it can be changed into a prime (18920933357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91107 + ... + 214807.

It is an arithmetic number, because the mean of its divisors is an integer number (2703136104).

Almost surely, 2^18920933857 is an apocalyptic number.

It is an amenable number.

18920933857 is a deficient number, since it is larger than the sum of its proper divisors (2704154975).

18920933857 is a wasteful number, since it uses less digits than its factorization.

18920933857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145559.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The spelling of 18920933857 in words is "eighteen billion, nine hundred twenty million, nine hundred thirty-three thousand, eight hundred fifty-seven".