23513240 has 32 divisors (see below), whose sum is σ = 53298000. Its totient is φ = 9335424.

The previous prime is 23513233. The next prime is 23513249. The reversal of 23513240 is 4231532.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23513249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3446 + ... + 7674.

Almost surely, 2^23513240 is an apocalyptic number.

23513240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23513240 is an abundant number, since it is smaller than the sum of its proper divisors (29784760).

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

23513240 is a wasteful number, since it uses less digits than its factorization.

23513240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4379 (or 4375 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 23513240 is about 4849.0452668541. The cubic root of 23513240 is about 286.4864981703.

Adding to 23513240 its reverse (4231532), we get a palindrome (27744772).

It can be divided in two parts, 23513 and 240, that multiplied together give a triangular number (5643120 = T₃₃₅₉).

The spelling of 23513240 in words is "twenty-three million, five hundred thirteen thousand, two hundred forty".