23205540 has 48 divisors (see below), whose sum is σ = 65197440. Its totient is φ = 6167040.

The previous prime is 23205521. The next prime is 23205541. The reversal of 23205540 is 4550232.

It is not an unprimeable number, because it can be changed into a prime (23205541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25900 + ... + 26780.

It is an arithmetic number, because the mean of its divisors is an integer number (1358280).

Almost surely, 2^23205540 is an apocalyptic number.

23205540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23205540 is an abundant number, since it is smaller than the sum of its proper divisors (41991900).

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

23205540 is a wasteful number, since it uses less digits than its factorization.

23205540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332 (or 1330 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 23205540 is about 4817.2128871371. The cubic root of 23205540 is about 285.2313295729.

Adding to 23205540 its reverse (4550232), we get a palindrome (27755772).

The spelling of 23205540 in words is "twenty-three million, two hundred five thousand, five hundred forty".