23239920 has 80 divisors (see below), whose sum is σ = 78602112. Its totient is φ = 5633280.

The previous prime is 23239891. The next prime is 23239921. The reversal of 23239920 is 2993232.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

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 (23239921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1762 + ... + 7041.

Almost surely, 2^23239920 is an apocalyptic number.

23239920 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 23239920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39301056).

23239920 is an abundant number, since it is smaller than the sum of its proper divisors (55362192).

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

23239920 is a wasteful number, since it uses less digits than its factorization.

23239920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8830 (or 8824 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 23239920 is about 4820.7800198723. The cubic root of 23239920 is about 285.3721208710.

The spelling of 23239920 in words is "twenty-three million, two hundred thirty-nine thousand, nine hundred twenty".