18420806 has 8 divisors (see below), whose sum is σ = 27681480. Its totient is φ = 9193648.

The previous prime is 18420791. The next prime is 18420811. The reversal of 18420806 is 60802481.

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

It is a Curzon number.

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, 6956 + ... + 9231.

It is an arithmetic number, because the mean of its divisors is an integer number (3460185).

Almost surely, 2^18420806 is an apocalyptic number.

18420806 is a deficient number, since it is larger than the sum of its proper divisors (9260674).

18420806 is a wasteful number, since it uses less digits than its factorization.

18420806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16758.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 18420806 is about 4291.9466445891. The cubic root of 18420806 is about 264.1006942944.

The spelling of 18420806 in words is "eighteen million, four hundred twenty thousand, eight hundred six".