23042540 has 24 divisors (see below), whose sum is σ = 48580560. Its totient is φ = 9180608.

The previous prime is 23042479. The next prime is 23042561. The reversal of 23042540 is 4524032.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3239 + ... + 7521.

It is an arithmetic number, because the mean of its divisors is an integer number (2024190).

Almost surely, 2^23042540 is an apocalyptic number.

23042540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23042540 is an abundant number, since it is smaller than the sum of its proper divisors (25538020).

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

23042540 is a wasteful number, since it uses less digits than its factorization.

23042540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4561 (or 4559 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 23042540 is about 4800.2645760416. The cubic root of 23042540 is about 284.5619205826.

Adding to 23042540 its reverse (4524032), we get a palindrome (27566572).

The spelling of 23042540 in words is "twenty-three million, forty-two thousand, five hundred forty".