23720191 has 8 divisors (see below), whose sum is σ = 26168400. Its totient is φ = 21320640.

The previous prime is 23720167. The next prime is 23720197. The reversal of 23720191 is 19102732.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 23720191 - 2⁷ = 23720063 is a prime.

It is a super-2 number, since 2×23720191² = 1125294922152962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23720197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11136 + ... + 13093.

It is an arithmetic number, because the mean of its divisors is an integer number (3271050).

Almost surely, 2^23720191 is an apocalyptic number.

23720191 is a deficient number, since it is larger than the sum of its proper divisors (2448209).

23720191 is a wasteful number, since it uses less digits than its factorization.

23720191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24329.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 23720191 is about 4870.3378732897. The cubic root of 23720191 is about 287.3245447409.

The spelling of 23720191 in words is "twenty-three million, seven hundred twenty thousand, one hundred ninety-one".