23173520 has 20 divisors (see below), whose sum is σ = 53878620. Its totient is φ = 9269376.

The previous prime is 23173471. The next prime is 23173529. The reversal of 23173520 is 2537132.

It can be written as a sum of positive squares in 2 ways, for example, as 18011536 + 5161984 = 4244^2 + 2272^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-3 number, since 3×23173520³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23173529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144755 + ... + 144914.

It is an arithmetic number, because the mean of its divisors is an integer number (2693931).

Almost surely, 2^23173520 is an apocalyptic number.

23173520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23173520 is an abundant number, since it is smaller than the sum of its proper divisors (30705100).

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

23173520 is a wasteful number, since it uses less digits than its factorization.

23173520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289682 (or 289676 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 23173520 is about 4813.8882413284. Note that the first 3 decimals coincide. The cubic root of 23173520 is about 285.1000777089.

The spelling of 23173520 in words is "twenty-three million, one hundred seventy-three thousand, five hundred twenty".