23409920 has 36 divisors (see below), whose sum is σ = 56077140. Its totient is φ = 9363456.

The previous prime is 23409917. The next prime is 23409973. The reversal of 23409920 is 2990432.

It can be written as a sum of positive squares in 2 ways, for example, as 17572864 + 5837056 = 4192^2 + 2416^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7865 + ... + 10424.

Almost surely, 2^23409920 is an apocalyptic number.

23409920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23409920 is an abundant number, since it is smaller than the sum of its proper divisors (32667220).

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

23409920 is an equidigital number, since it uses as much as digits as its factorization.

23409920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18310 (or 18296 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 23409920 is about 4838.3798941381. The cubic root of 23409920 is about 286.0662633559.

The spelling of 23409920 in words is "twenty-three million, four hundred nine thousand, nine hundred twenty".