20312211011 has 4 divisors (see below), whose sum is σ = 20314683432. Its totient is φ = 20309738592.

The previous prime is 20312210999. The next prime is 20312211013. The reversal of 20312211011 is 11011221302.

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 20312211011 - 2¹⁰ = 20312209987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20312211013) 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, 1223846 + ... + 1240331.

It is an arithmetic number, because the mean of its divisors is an integer number (5078670858).

Almost surely, 2^20312211011 is an apocalyptic number.

20312211011 is a deficient number, since it is larger than the sum of its proper divisors (2472421).

20312211011 is an equidigital number, since it uses as much as digits as its factorization.

20312211011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2472420.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 20312211011 its reverse (11011221302), we get a palindrome (31323432313).

The spelling of 20312211011 in words is "twenty billion, three hundred twelve million, two hundred eleven thousand, eleven".