23720113 has 4 divisors (see below), whose sum is σ = 24968560. Its totient is φ = 22471668.

The previous prime is 23720111. The next prime is 23720129. The reversal of 23720113 is 31102732.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23720113 - 2¹ = 23720111 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1248427 = 23720113 / (2 + 3 + 7 + 2 + 0 + 1 + 1 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23720111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 624195 + ... + 624232.

It is an arithmetic number, because the mean of its divisors is an integer number (6242140).

Almost surely, 2^23720113 is an apocalyptic number.

It is an amenable number.

23720113 is a deficient number, since it is larger than the sum of its proper divisors (1248447).

23720113 is a wasteful number, since it uses less digits than its factorization.

23720113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248446.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 23720113 is about 4870.3298656251. The cubic root of 23720113 is about 287.3242298005.

Adding to 23720113 its reverse (31102732), we get a palindrome (54822845).

The spelling of 23720113 in words is "twenty-three million, seven hundred twenty thousand, one hundred thirteen".