18820445 has 32 divisors (see below), whose sum is σ = 27952128. Its totient is φ = 11870208.

The previous prime is 18820433. The next prime is 18820453. The reversal of 18820445 is 54402881.

It is a happy number.

It is not a de Polignac number, because 18820445 - 2⁴ = 18820429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27629 + ... + 28301.

It is an arithmetic number, because the mean of its divisors is an integer number (873504).

Almost surely, 2^18820445 is an apocalyptic number.

It is an amenable number.

18820445 is a deficient number, since it is larger than the sum of its proper divisors (9131683).

18820445 is a wasteful number, since it uses less digits than its factorization.

18820445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749.

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 18820445 is about 4338.2536809182. The cubic root of 18820445 is about 265.9969330869.

The spelling of 18820445 in words is "eighteen million, eight hundred twenty thousand, four hundred forty-five".