22497240 has 32 divisors (see below), whose sum is σ = 67492080. Its totient is φ = 5999232.

The previous prime is 22497229. The next prime is 22497247. The reversal of 22497240 is 4279422.

It is a super-2 number, since 2×22497240² = 1012251615235200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 22497198 and 22497207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22497247) 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, 93619 + ... + 93858.

Almost surely, 2^22497240 is an apocalyptic number.

22497240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22497240 is an abundant number, since it is smaller than the sum of its proper divisors (44994840).

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

22497240 is a wasteful number, since it uses less digits than its factorization.

22497240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187491 (or 187487 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 22497240 is about 4743.1255517854. The cubic root of 22497240 is about 282.2992648170.

The spelling of 22497240 in words is "twenty-two million, four hundred ninety-seven thousand, two hundred forty".