18820533 has 8 divisors (see below), whose sum is σ = 25200000. Its totient is φ = 12494048.

The previous prime is 18820519. The next prime is 18820553. The reversal of 18820533 is 33502881.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18820533 - 2¹² = 18816437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18820533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18820553) 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, 12408 + ... + 13841.

It is an arithmetic number, because the mean of its divisors is an integer number (3150000).

Almost surely, 2^18820533 is an apocalyptic number.

It is an amenable number.

18820533 is a deficient number, since it is larger than the sum of its proper divisors (6379467).

18820533 is a wasteful number, since it uses less digits than its factorization.

18820533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26491.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 18820533 is about 4338.2638232362. The cubic root of 18820533 is about 265.9973476661.

The spelling of 18820533 in words is "eighteen million, eight hundred twenty thousand, five hundred thirty-three".