23509920 has 96 divisors (see below), whose sum is σ = 84647808. Its totient is φ = 5372928.

The previous prime is 23509919. The next prime is 23509921. The reversal of 23509920 is 2990532.

It is an interprime number because it is at equal distance from previous prime (23509919) and next prime (23509921).

It is a tau number, because it is divible by the number of its divisors (96).

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

It is not an unprimeable number, because it can be changed into a prime (23509921) 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, 139 + ... + 6858.

It is an arithmetic number, because the mean of its divisors is an integer number (881748).

Almost surely, 2^23509920 is an apocalyptic number.

23509920 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 23509920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42323904).

23509920 is an abundant number, since it is smaller than the sum of its proper divisors (61137888).

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

23509920 is a wasteful number, since it uses less digits than its factorization.

23509920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7022 (or 7014 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 23509920 is about 4848.7029193383. The cubic root of 23509920 is about 286.4730138533.

The spelling of 23509920 in words is "twenty-three million, five hundred nine thousand, nine hundred twenty".