23720857 has 2 divisors, whose sum is σ = 23720858. Its totient is φ = 23720856.

The previous prime is 23720849. The next prime is 23720861. The reversal of 23720857 is 75802732.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15217801 + 8503056 = 3901^2 + 2916^2 .

It is a cyclic number.

It is not a de Polignac number, because 23720857 - 2³ = 23720849 is a prime.

It is not a weakly prime, because it can be changed into another prime (23720657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11860428 + 11860429.

It is an arithmetic number, because the mean of its divisors is an integer number (11860429).

Almost surely, 2^23720857 is an apocalyptic number.

It is an amenable number.

23720857 is a deficient number, since it is larger than the sum of its proper divisors (1).

23720857 is an equidigital number, since it uses as much as digits as its factorization.

23720857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 23720857 is about 4870.4062458896. The cubic root of 23720857 is about 287.3272338193.

The spelling of 23720857 in words is "twenty-three million, seven hundred twenty thousand, eight hundred fifty-seven".