22312320 has 64 divisors (see below), whose sum is σ = 71126640. Its totient is φ = 5949440.

The previous prime is 22312319. The next prime is 22312321. The reversal of 22312320 is 2321322.

It is an interprime number because it is at equal distance from previous prime (22312319) and next prime (22312321).

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-3 number, since 3×22312320³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 22312320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22312321) 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, 3891 + ... + 7730.

Almost surely, 2^22312320 is an apocalyptic number.

22312320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22312320 is an abundant number, since it is smaller than the sum of its proper divisors (48814320).

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

22312320 is a wasteful number, since it uses less digits than its factorization.

22312320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11643 (or 11631 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 22312320 is about 4723.5918536639. The cubic root of 22312320 is about 281.5236664657.

Adding to 22312320 its reverse (2321322), we get a palindrome (24633642).

The spelling of 22312320 in words is "twenty-two million, three hundred twelve thousand, three hundred twenty".