20111031103 has 4 divisors (see below), whose sum is σ = 20255714920. Its totient is φ = 19966347288.

The previous prime is 20111031079. The next prime is 20111031107. The reversal of 20111031103 is 30113011102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20111031103 - 2⁹ = 20111030591 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 (20111031107) 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, 72341700 + ... + 72341977.

It is an arithmetic number, because the mean of its divisors is an integer number (5063928730).

Almost surely, 2^20111031103 is an apocalyptic number.

20111031103 is a deficient number, since it is larger than the sum of its proper divisors (144683817).

20111031103 is a wasteful number, since it uses less digits than its factorization.

20111031103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144683816.

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 20111031103 its reverse (30113011102), we get a palindrome (50224042205).

The spelling of 20111031103 in words is "twenty billion, one hundred eleven million, thirty-one thousand, one hundred three".