23113640 has 64 divisors (see below), whose sum is σ = 57309120. Its totient is φ = 8320000.

The previous prime is 23113639. The next prime is 23113669. The reversal of 23113640 is 4631132.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57440 + ... + 57840.

It is an arithmetic number, because the mean of its divisors is an integer number (895455).

Almost surely, 2^23113640 is an apocalyptic number.

23113640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23113640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28654560).

23113640 is an abundant number, since it is smaller than the sum of its proper divisors (34195480).

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

23113640 is a wasteful number, since it uses less digits than its factorization.

23113640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 23113640 is about 4807.6647137670. The cubic root of 23113640 is about 284.8543012334.

Adding to 23113640 its reverse (4631132), we get a palindrome (27744772).

The spelling of 23113640 in words is "twenty-three million, one hundred thirteen thousand, six hundred forty".