23311240 has 16 divisors (see below), whose sum is σ = 52450380. Its totient is φ = 9324480.

The previous prime is 23311237. The next prime is 23311261. The reversal of 23311240 is 4211332.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20958084 + 2353156 = 4578^2 + 1534^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 291351 + ... + 291430.

Almost surely, 2^23311240 is an apocalyptic number.

23311240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23311240 is an abundant number, since it is smaller than the sum of its proper divisors (29139140).

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

23311240 is a wasteful number, since it uses less digits than its factorization.

23311240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582792 (or 582788 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 23311240 is about 4828.1714965399. The cubic root of 23311240 is about 285.6637448697.

Adding to 23311240 its reverse (4211332), we get a palindrome (27522572).

The spelling of 23311240 in words is "twenty-three million, three hundred eleven thousand, two hundred forty".