18720006 has 16 divisors (see below), whose sum is σ = 38237184. Its totient is φ = 6107144.

The previous prime is 18719983. The next prime is 18720083. The reversal of 18720006 is 60002781.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32910 + ... + 33473.

It is an arithmetic number, because the mean of its divisors is an integer number (2389824).

Almost surely, 2^18720006 is an apocalyptic number.

18720006 is an abundant number, since it is smaller than the sum of its proper divisors (19517178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18720006 is a wasteful number, since it uses less digits than its factorization.

18720006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66435.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 18720006 is about 4326.6622239320. The cubic root of 18720006 is about 265.5229072202.

Adding to 18720006 its reverse (60002781), we get a palindrome (78722787).

The spelling of 18720006 in words is "eighteen million, seven hundred twenty thousand, six".