23565720 has 64 divisors (see below), whose sum is σ = 72357120. Its totient is φ = 6136704.

The previous prime is 23565683. The next prime is 23565727. The reversal of 23565720 is 2756532.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23565727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2877 + ... + 7443.

It is an arithmetic number, because the mean of its divisors is an integer number (1130580).

Almost surely, 2^23565720 is an apocalyptic number.

23565720 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 23565720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36178560).

23565720 is an abundant number, since it is smaller than the sum of its proper divisors (48791400).

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

23565720 is a wasteful number, since it uses less digits than its factorization.

23565720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4624 (or 4620 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 30.

The square root of 23565720 is about 4854.4536252806. The cubic root of 23565720 is about 286.6994794481.

The spelling of 23565720 in words is "twenty-three million, five hundred sixty-five thousand, seven hundred twenty".