23013640 has 32 divisors (see below), whose sum is σ = 55765080. Its totient is φ = 8497152.

The previous prime is 23013637. The next prime is 23013647. The reversal of 23013640 is 4631032.

It can be written as a sum of positive squares in 4 ways, for example, as 19838116 + 3175524 = 4454^2 + 1782^2 .

It is not an unprimeable number, because it can be changed into a prime (23013647) 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, 21609 + ... + 22648.

Almost surely, 2^23013640 is an apocalyptic number.

23013640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23013640 is an abundant number, since it is smaller than the sum of its proper divisors (32751440).

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

23013640 is a wasteful number, since it uses less digits than its factorization.

23013640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44281 (or 44277 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 23013640 is about 4797.2533808420. The cubic root of 23013640 is about 284.4429047678.

Adding to 23013640 its reverse (4631032), we get a palindrome (27644672).

It can be divided in two parts, 23013 and 640, that added together give a triangular number (23653 = T₂₁₇).

The spelling of 23013640 in words is "twenty-three million, thirteen thousand, six hundred forty".