18720914 has 4 divisors (see below), whose sum is σ = 28081374. Its totient is φ = 9360456.

The previous prime is 18720907. The next prime is 18720941. The reversal of 18720914 is 41902781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 41902781 = 4271 ⋅9811.

It can be written as a sum of positive squares in only one way, i.e., 14025025 + 4695889 = 3745^2 + 2167^2 .

It is a Curzon 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 as a sum of consecutive naturals, namely, 4680227 + ... + 4680230.

Almost surely, 2^18720914 is an apocalyptic number.

18720914 is a deficient number, since it is larger than the sum of its proper divisors (9360460).

18720914 is an equidigital number, since it uses as much as digits as its factorization.

18720914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9360459.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 18720914 is about 4326.7671534299. The cubic root of 18720914 is about 265.5272001480.

The spelling of 18720914 in words is "eighteen million, seven hundred twenty thousand, nine hundred fourteen".