23120257 has 4 divisors (see below), whose sum is σ = 23289156. Its totient is φ = 22951360.

The previous prime is 23120249. The next prime is 23120299. The reversal of 23120257 is 75202132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9585216 + 13535041 = 3096^2 + 3679^2 .

It is a cyclic number.

It is not a de Polignac number, because 23120257 - 2³ = 23120249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23120557) 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, 84244 + ... + 84517.

It is an arithmetic number, because the mean of its divisors is an integer number (5822289).

Almost surely, 2^23120257 is an apocalyptic number.

It is an amenable number.

23120257 is a deficient number, since it is larger than the sum of its proper divisors (168899).

23120257 is a wasteful number, since it uses less digits than its factorization.

23120257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168898.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 23120257 is about 4808.3528364711. The cubic root of 23120257 is about 284.8814814478.

Adding to 23120257 its reverse (75202132), we get a palindrome (98322389).

The spelling of 23120257 in words is "twenty-three million, one hundred twenty thousand, two hundred fifty-seven".