22320581 has 8 divisors (see below), whose sum is σ = 22945920. Its totient is φ = 21703968.

The previous prime is 22320563. The next prime is 22320587. The reversal of 22320581 is 18502322.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22320581 - 2¹⁸ = 22058437 is a prime.

It is a super-3 number, since 3×22320581³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22320587) 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, 3185 + ... + 7401.

It is an arithmetic number, because the mean of its divisors is an integer number (2868240).

Almost surely, 2^22320581 is an apocalyptic number.

It is an amenable number.

22320581 is a deficient number, since it is larger than the sum of its proper divisors (625339).

22320581 is an equidigital number, since it uses as much as digits as its factorization.

22320581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4363.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 22320581 is about 4724.4662132351. The cubic root of 22320581 is about 281.5584063172.

The spelling of 22320581 in words is "twenty-two million, three hundred twenty thousand, five hundred eighty-one".