20186745 has 8 divisors (see below), whose sum is σ = 32298816. Its totient is φ = 10766256.

The previous prime is 20186723. The next prime is 20186783. The reversal of 20186745 is 54768102.

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

It is not a de Polignac number, because 20186745 - 2²⁴ = 3409529 is a prime.

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, 672877 + ... + 672906.

It is an arithmetic number, because the mean of its divisors is an integer number (4037352).

Almost surely, 2^20186745 is an apocalyptic number.

It is an amenable number.

20186745 is a deficient number, since it is larger than the sum of its proper divisors (12112071).

20186745 is a wasteful number, since it uses less digits than its factorization.

20186745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1345791.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 20186745 is about 4492.9661694698. The cubic root of 20186745 is about 272.2839855846.

The spelling of 20186745 in words is "twenty million, one hundred eighty-six thousand, seven hundred forty-five".