20123022091 has 4 divisors (see below), whose sum is σ = 20123317000. Its totient is φ = 20122727184.

The previous prime is 20123022083. The next prime is 20123022109. The reversal of 20123022091 is 19022032102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20123022091 - 2³ = 20123022083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20123022001) 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, 13360 + ... + 201058.

It is an arithmetic number, because the mean of its divisors is an integer number (5030829250).

Almost surely, 2^20123022091 is an apocalyptic number.

20123022091 is a deficient number, since it is larger than the sum of its proper divisors (294909).

20123022091 is a wasteful number, since it uses less digits than its factorization.

20123022091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294908.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 20123022091 its reverse (19022032102), we get a palindrome (39145054193).

The spelling of 20123022091 in words is "twenty billion, one hundred twenty-three million, twenty-two thousand, ninety-one".