22533420 has 96 divisors (see below), whose sum is σ = 77672448. Its totient is φ = 4753152.

The previous prime is 22533397. The next prime is 22533437. The reversal of 22533420 is 2433522.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3397 + ... + 7523.

It is an arithmetic number, because the mean of its divisors is an integer number (809088).

Almost surely, 2^22533420 is an apocalyptic number.

22533420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22533420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38836224).

22533420 is an abundant number, since it is smaller than the sum of its proper divisors (55139028).

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

22533420 is a wasteful number, since it uses less digits than its factorization.

22533420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4159 (or 4157 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 21.

The square root of 22533420 is about 4746.9379604120. The cubic root of 22533420 is about 282.4505147353.

Adding to 22533420 its reverse (2433522), we get a palindrome (24966942).

The spelling of 22533420 in words is "twenty-two million, five hundred thirty-three thousand, four hundred twenty".