20123310191 has 8 divisors (see below), whose sum is σ = 21529686000. Its totient is φ = 18751659840.

The previous prime is 20123310173. The next prime is 20123310197. The reversal of 20123310191 is 19101332102.

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

It is a cyclic number.

It is not a de Polignac number, because 20123310191 - 2³⁰ = 19049568367 is a prime.

It is a super-2 number, since 2×20123310191² (a number of 21 digits) 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 (20123310197) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8680166 + ... + 8682483.

It is an arithmetic number, because the mean of its divisors is an integer number (2691210750).

Almost surely, 2^20123310191 is an apocalyptic number.

20123310191 is a deficient number, since it is larger than the sum of its proper divisors (1406375809).

20123310191 is a wasteful number, since it uses less digits than its factorization.

20123310191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17362729.

The product of its (nonzero) digits is 324, while the sum is 23.

Adding to 20123310191 its reverse (19101332102), we get a palindrome (39224642293).

The spelling of 20123310191 in words is "twenty billion, one hundred twenty-three million, three hundred ten thousand, one hundred ninety-one".