18220533 has 8 divisors (see below), whose sum is σ = 24435168. Its totient is φ = 12076464.

The previous prime is 18220513. The next prime is 18220561. The reversal of 18220533 is 33502281.

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

It is not a de Polignac number, because 18220533 - 2⁶ = 18220469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18220513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17035 + ... + 18072.

It is an arithmetic number, because the mean of its divisors is an integer number (3054396).

Almost surely, 2^18220533 is an apocalyptic number.

It is an amenable number.

18220533 is a deficient number, since it is larger than the sum of its proper divisors (6214635).

18220533 is a wasteful number, since it uses less digits than its factorization.

18220533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35283.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 18220533 is about 4268.5516278944. The cubic root of 18220533 is about 263.1400941272.

The spelling of 18220533 in words is "eighteen million, two hundred twenty thousand, five hundred thirty-three".