22531000 has 32 divisors (see below), whose sum is σ = 52724880. Its totient is φ = 9012000.

The previous prime is 22530997. The next prime is 22531009. The reversal of 22531000 is 13522.

It is a super-2 number, since 2×22531000² = 1015291922000000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22531009) 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, 10266 + ... + 12265.

Almost surely, 2^22531000 is an apocalyptic number.

22531000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22531000 is an abundant number, since it is smaller than the sum of its proper divisors (30193880).

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

22531000 is a wasteful number, since it uses less digits than its factorization.

22531000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22552 (or 22538 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 22531000 is about 4746.6830524062. The cubic root of 22531000 is about 282.4404030180.

Adding to 22531000 its reverse (13522), we get a palindrome (22544522).

The spelling of 22531000 in words is "twenty-two million, five hundred thirty-one thousand".