18820033 has 4 divisors (see below), whose sum is σ = 18828720. Its totient is φ = 18811348.

The previous prime is 18820031. The next prime is 18820063. The reversal of 18820033 is 33002881.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18820033 - 2¹ = 18820031 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18820031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1866 + ... + 6412.

It is an arithmetic number, because the mean of its divisors is an integer number (4707180).

Almost surely, 2^18820033 is an apocalyptic number.

It is an amenable number.

18820033 is a deficient number, since it is larger than the sum of its proper divisors (8687).

18820033 is an equidigital number, since it uses as much as digits as its factorization.

18820033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8686.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 18820033 is about 4338.2061961138. The cubic root of 18820033 is about 265.9949920854.

The spelling of 18820033 in words is "eighteen million, eight hundred twenty thousand, thirty-three".