23207540 has 24 divisors (see below), whose sum is σ = 50417640. Its totient is φ = 8962688.

The previous prime is 23207539. The next prime is 23207543. The reversal of 23207540 is 4570232.

It can be written as a sum of positive squares in 4 ways, for example, as 2010724 + 21196816 = 1418^2 + 4604^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23207543) 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, 19427 + ... + 20586.

It is an arithmetic number, because the mean of its divisors is an integer number (2100735).

Almost surely, 2^23207540 is an apocalyptic number.

23207540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23207540 is an abundant number, since it is smaller than the sum of its proper divisors (27210100).

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

23207540 is a wasteful number, since it uses less digits than its factorization.

23207540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40051 (or 40049 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 23.

The square root of 23207540 is about 4817.4204715802. The cubic root of 23207540 is about 285.2395236834.

Adding to 23207540 its reverse (4570232), we get a palindrome (27777772).

The spelling of 23207540 in words is "twenty-three million, two hundred seven thousand, five hundred forty".