22320564 has 48 divisors (see below), whose sum is σ = 60982656. Its totient is φ = 6220800.

The previous prime is 22320563. The next prime is 22320587. The reversal of 22320564 is 46502322.

It is a super-3 number, since 3×22320564³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22320563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204 + ... + 6684.

It is an arithmetic number, because the mean of its divisors is an integer number (1270472).

Almost surely, 2^22320564 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 22320564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30491328).

22320564 is an abundant number, since it is smaller than the sum of its proper divisors (38662092).

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

22320564 is a wasteful number, since it uses less digits than its factorization.

22320564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6536 (or 6534 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 22320564 is about 4724.4644140897. The cubic root of 22320564 is about 281.5583348361.

Adding to 22320564 its reverse (46502322), we get a palindrome (68822886).

The spelling of 22320564 in words is "twenty-two million, three hundred twenty thousand, five hundred sixty-four".