20123443111 has 8 divisors (see below), whose sum is σ = 20326069584. Its totient is φ = 19920883200.

The previous prime is 20123443103. The next prime is 20123443121. The reversal of 20123443111 is 11134432102.

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 20123443111 - 2³ = 20123443103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123443121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 782520 + ... + 807826.

It is an arithmetic number, because the mean of its divisors is an integer number (2540758698).

Almost surely, 2^20123443111 is an apocalyptic number.

20123443111 is a deficient number, since it is larger than the sum of its proper divisors (202626473).

20123443111 is a wasteful number, since it uses less digits than its factorization.

20123443111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33281.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 20123443111 its reverse (11134432102), we get a palindrome (31257875213).

The spelling of 20123443111 in words is "twenty billion, one hundred twenty-three million, four hundred forty-three thousand, one hundred eleven".