22507640 has 16 divisors (see below), whose sum is σ = 50642280. Its totient is φ = 9003040.

The previous prime is 22507637. The next prime is 22507649. The reversal of 22507640 is 4670522.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22507649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281306 + ... + 281385.

Almost surely, 2^22507640 is an apocalyptic number.

22507640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22507640 is an abundant number, since it is smaller than the sum of its proper divisors (28134640).

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

22507640 is a wasteful number, since it uses less digits than its factorization.

22507640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562702 (or 562698 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 22507640 is about 4744.2217486117. The cubic root of 22507640 is about 282.3427584495.

The spelling of 22507640 in words is "twenty-two million, five hundred seven thousand, six hundred forty".