18920686 has 8 divisors (see below), whose sum is σ = 28463400. Its totient is φ = 9432888.

The previous prime is 18920663. The next prime is 18920701. The reversal of 18920686 is 68602981.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12856 + ... + 14251.

It is an arithmetic number, because the mean of its divisors is an integer number (3557925).

Almost surely, 2^18920686 is an apocalyptic number.

18920686 is a deficient number, since it is larger than the sum of its proper divisors (9542714).

18920686 is a wasteful number, since it uses less digits than its factorization.

18920686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27458.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 18920686 is about 4349.7914892555. The cubic root of 18920686 is about 266.4683459477.

The spelling of 18920686 in words is "eighteen million, nine hundred twenty thousand, six hundred eighty-six".