22505431 has 8 divisors (see below), whose sum is σ = 25290720. Its totient is φ = 19870752.

The previous prime is 22505429. The next prime is 22505447. The reversal of 22505431 is 13450522.

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 22505431 - 2¹ = 22505429 is a prime.

It is a super-2 number, since 2×22505431² = 1012988848991522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22505831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37336 + ... + 37933.

It is an arithmetic number, because the mean of its divisors is an integer number (3161340).

Almost surely, 2^22505431 is an apocalyptic number.

22505431 is a deficient number, since it is larger than the sum of its proper divisors (2785289).

22505431 is a wasteful number, since it uses less digits than its factorization.

22505431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75305.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 22505431 is about 4743.9889333766. The cubic root of 22505431 is about 282.3335213555. Note that the first 3 decimals are identical.

Adding to 22505431 its reverse (13450522), we get a palindrome (35955953).

The spelling of 22505431 in words is "twenty-two million, five hundred five thousand, four hundred thirty-one".