18820337 has 4 divisors (see below), whose sum is σ = 18996336. Its totient is φ = 18644340.

The previous prime is 18820331. The next prime is 18820363. The reversal of 18820337 is 73302881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18820337 - 2⁶ = 18820273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18820331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87839 + ... + 88052.

It is an arithmetic number, because the mean of its divisors is an integer number (4749084).

Almost surely, 2^18820337 is an apocalyptic number.

It is an amenable number.

18820337 is a deficient number, since it is larger than the sum of its proper divisors (175999).

18820337 is a wasteful number, since it uses less digits than its factorization.

18820337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175998.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 18820337 is about 4338.2412334954. The cubic root of 18820337 is about 265.9964242834.

The spelling of 18820337 in words is "eighteen million, eight hundred twenty thousand, three hundred thirty-seven".