18520745 has 8 divisors (see below), whose sum is σ = 22742016. Its totient is φ = 14471856.

The previous prime is 18520729. The next prime is 18520751. The reversal of 18520745 is 54702581.

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

It is a cyclic number.

It is not a de Polignac number, because 18520745 - 2⁴ = 18520729 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42857 + ... + 43286.

It is an arithmetic number, because the mean of its divisors is an integer number (2842752).

Almost surely, 2^18520745 is an apocalyptic number.

It is an amenable number.

18520745 is a deficient number, since it is larger than the sum of its proper divisors (4221271).

18520745 is an equidigital number, since it uses as much as digits as its factorization.

18520745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86191.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 18520745 is about 4303.5735151151. The cubic root of 18520745 is about 264.5774445269.

The spelling of 18520745 in words is "eighteen million, five hundred twenty thousand, seven hundred forty-five".