23009840 has 80 divisors (see below), whose sum is σ = 64763712. Its totient is φ = 7421952.

The previous prime is 23009839. The next prime is 23009873. The reversal of 23009840 is 4890032.

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

It is a congruent number.

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, 8312 + ... + 10728.

Almost surely, 2^23009840 is an apocalyptic number.

23009840 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 23009840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32381856).

23009840 is an abundant number, since it is smaller than the sum of its proper divisors (41753872).

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

23009840 is a wasteful number, since it uses less digits than its factorization.

23009840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2454 (or 2448 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 23009840 is about 4796.8573045276. The cubic root of 23009840 is about 284.4272482190.

Adding to 23009840 its reverse (4890032), we get a palindrome (27899872).

The spelling of 23009840 in words is "twenty-three million, nine thousand, eight hundred forty".