23340640 has 24 divisors (see below), whose sum is σ = 55142640. Its totient is φ = 9336192.

The previous prime is 23340637. The next prime is 23340649. The reversal of 23340640 is 4604332.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23340649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72780 + ... + 73099.

It is an arithmetic number, because the mean of its divisors is an integer number (2297610).

Almost surely, 2^23340640 is an apocalyptic number.

23340640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23340640 is an abundant number, since it is smaller than the sum of its proper divisors (31802000).

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

23340640 is a wasteful number, since it uses less digits than its factorization.

23340640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145894 (or 145886 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 23340640 is about 4831.2151680504. The cubic root of 23340640 is about 285.7837869017.

Adding to 23340640 its reverse (4604332), we get a palindrome (27944972).

The spelling of 23340640 in words is "twenty-three million, three hundred forty thousand, six hundred forty".