23920 has 40 divisors (see below), whose sum is σ = 62496. Its totient is φ = 8448.

The previous prime is 23917. The next prime is 23929. The reversal of 23920 is 2932.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (16) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 23894 and 23903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1029 + ... + 1051.

2²³⁹²⁰ is an apocalyptic number.

23920 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 23920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31248).

23920 is an abundant number, since it is smaller than the sum of its proper divisors (38576).

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

23920 is a wasteful number, since it uses less digits than its factorization.

23920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49 (or 43 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 23920 is about 154.6609194334. The cubic root of 23920 is about 28.8129057385.

The spelling of 23920 in words is "twenty-three thousand, nine hundred twenty".