23136540 has 96 divisors (see below), whose sum is σ = 76468224. Its totient is φ = 5114880.

The previous prime is 23136527. The next prime is 23136559. The reversal of 23136540 is 4563132.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 23136540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12132 + ... + 13908.

It is an arithmetic number, because the mean of its divisors is an integer number (796544).

Almost surely, 2^23136540 is an apocalyptic number.

23136540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23136540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38234112).

23136540 is an abundant number, since it is smaller than the sum of its proper divisors (53331684).

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

23136540 is a wasteful number, since it uses less digits than its factorization.

23136540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1827 (or 1825 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 23136540 is about 4810.0457378283. The cubic root of 23136540 is about 284.9483439774.

Adding to 23136540 its reverse (4563132), we get a palindrome (27699672).

The spelling of 23136540 in words is "twenty-three million, one hundred thirty-six thousand, five hundred forty".