22505231 has 8 divisors (see below), whose sum is σ = 26205984. Its totient is φ = 18925920.

The previous prime is 22505207. The next prime is 22505239. The reversal of 22505231 is 13250522.

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 22505231 - 2⁶ = 22505167 is a prime.

It is a super-2 number, since 2×22505231² = 1012970844726722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22505239) 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, 29960 + ... + 30701.

It is an arithmetic number, because the mean of its divisors is an integer number (3275748).

Almost surely, 2^22505231 is an apocalyptic number.

22505231 is a deficient number, since it is larger than the sum of its proper divisors (3700753).

22505231 is an equidigital number, since it uses as much as digits as its factorization.

22505231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60721.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 22505231 is about 4743.9678540226. The cubic root of 22505231 is about 282.3326850111.

Adding to 22505231 its reverse (13250522), we get a palindrome (35755753).

The spelling of 22505231 in words is "twenty-two million, five hundred five thousand, two hundred thirty-one".