23005540 has 48 divisors (see below), whose sum is σ = 49840560. Its totient is φ = 8916480.

The previous prime is 23005537. The next prime is 23005547. The reversal of 23005540 is 4550032.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 23104 + 22982436 = 152^2 + 4794^2 .

It is not an unprimeable number, because it can be changed into a prime (23005547) 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, 132894 + ... + 133066.

It is an arithmetic number, because the mean of its divisors is an integer number (1038345).

Almost surely, 2^23005540 is an apocalyptic number.

23005540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23005540 is an abundant number, since it is smaller than the sum of its proper divisors (26835020).

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

23005540 is a wasteful number, since it uses less digits than its factorization.

23005540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352 (or 350 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 19.

The square root of 23005540 is about 4796.4090734632. The cubic root of 23005540 is about 284.4095295189.

Adding to 23005540 its reverse (4550032), we get a palindrome (27555572).

The spelling of 23005540 in words is "twenty-three million, five thousand, five hundred forty".