20331231011 has 32 divisors (see below), whose sum is σ = 25275532800. Its totient is φ = 15924625920.

The previous prime is 20331231007. The next prime is 20331231013. The reversal of 20331231011 is 11013213302.

It is not a de Polignac number, because 20331231011 - 2² = 20331231007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20331231013) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4791851 + ... + 4796091.

It is an arithmetic number, because the mean of its divisors is an integer number (789860400).

Almost surely, 2^20331231011 is an apocalyptic number.

20331231011 is a deficient number, since it is larger than the sum of its proper divisors (4944301789).

20331231011 is a wasteful number, since it uses less digits than its factorization.

20331231011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4779.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 20331231011 its reverse (11013213302), we get a palindrome (31344444313).

The spelling of 20331231011 in words is "twenty billion, three hundred thirty-one million, two hundred thirty-one thousand, eleven".