22505031 has 6 divisors (see below), whose sum is σ = 32507280. Its totient is φ = 15003348.

The previous prime is 22505027. The next prime is 22505033. The reversal of 22505031 is 13050522.

It is a happy number.

It is not a de Polignac number, because 22505031 - 2² = 22505027 is a prime.

It is a super-2 number, since 2×22505031² = 1012952840621922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22504995 and 22505013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22505033) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1250271 + ... + 1250288.

It is an arithmetic number, because the mean of its divisors is an integer number (5417880).

Almost surely, 2^22505031 is an apocalyptic number.

22505031 is a deficient number, since it is larger than the sum of its proper divisors (10002249).

22505031 is a wasteful number, since it uses less digits than its factorization.

22505031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2500565 (or 2500562 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 22505031 is about 4743.9467745749. The cubic root of 22505031 is about 282.3318486618.

Adding to 22505031 its reverse (13050522), we get a palindrome (35555553).

The spelling of 22505031 in words is "twenty-two million, five hundred five thousand, thirty-one".