22533156 has 72 divisors (see below), whose sum is σ = 59940608. Its totient is φ = 7128000.

The previous prime is 22533131. The next prime is 22533157. The reversal of 22533156 is 65133522.

It is not an unprimeable number, because it can be changed into a prime (22533157) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67911 + ... + 68241.

Almost surely, 2^22533156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22533156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29970304).

22533156 is an abundant number, since it is smaller than the sum of its proper divisors (37407452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22533156 is a wasteful number, since it uses less digits than its factorization.

22533156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433 (or 428 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 22533156 is about 4746.9101529311. The cubic root of 22533156 is about 282.4494116740.

Adding to 22533156 its reverse (65133522), we get a palindrome (87666678).

The spelling of 22533156 in words is "twenty-two million, five hundred thirty-three thousand, one hundred fifty-six".