18820217834 has 8 divisors (see below), whose sum is σ = 30796720128. Its totient is φ = 8554644460.

The previous prime is 18820217809. The next prime is 18820217881. The reversal of 18820217834 is 43871202881.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 427732202 + ... + 427732245.

It is an arithmetic number, because the mean of its divisors is an integer number (3849590016).

Almost surely, 2^18820217834 is an apocalyptic number.

18820217834 is a deficient number, since it is larger than the sum of its proper divisors (11976502294).

18820217834 is a wasteful number, since it uses less digits than its factorization.

18820217834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855464460.

The product of its (nonzero) digits is 172032, while the sum is 44.

The spelling of 18820217834 in words is "eighteen billion, eight hundred twenty million, two hundred seventeen thousand, eight hundred thirty-four".