23521040 has 20 divisors (see below), whose sum is σ = 54686604. Its totient is φ = 9408384.

The previous prime is 23521039. The next prime is 23521049. The reversal of 23521040 is 4012532.

It can be written as a sum of positive squares in 2 ways, for example, as 5914624 + 17606416 = 2432^2 + 4196^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (23521049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146927 + ... + 147086.

Almost surely, 2^23521040 is an apocalyptic number.

23521040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23521040 is an abundant number, since it is smaller than the sum of its proper divisors (31165564).

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

23521040 is a wasteful number, since it uses less digits than its factorization.

23521040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294026 (or 294020 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 23521040 is about 4849.8494822005. The cubic root of 23521040 is about 286.5181731988.

Adding to 23521040 its reverse (4012532), we get a palindrome (27533572).

The spelling of 23521040 in words is "twenty-three million, five hundred twenty-one thousand, forty".