22572420 has 96 divisors (see below), whose sum is σ = 69750912. Its totient is φ = 5419008.

The previous prime is 22572419. The next prime is 22572439. The reversal of 22572420 is 2427522.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33204 + ... + 33876.

It is an arithmetic number, because the mean of its divisors is an integer number (726572).

Almost surely, 2^22572420 is an apocalyptic number.

22572420 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 22572420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34875456).

22572420 is an abundant number, since it is smaller than the sum of its proper divisors (47178492).

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

22572420 is a wasteful number, since it uses less digits than its factorization.

22572420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741 (or 739 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 24.

The square root of 22572420 is about 4751.0440957752. The cubic root of 22572420 is about 282.6133724087.

Adding to 22572420 its reverse (2427522), we get a palindrome (24999942).

The spelling of 22572420 in words is "twenty-two million, five hundred seventy-two thousand, four hundred twenty".