20011320311 has 4 divisors (see below), whose sum is σ = 20051104752. Its totient is φ = 19971535872.

The previous prime is 20011320299. The next prime is 20011320319. The reversal of 20011320311 is 11302311002.

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 20011320311 - 2¹⁰ = 20011319287 is a prime.

It is a super-2 number, since 2×20011320311² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011320319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19891466 + ... + 19892471.

It is an arithmetic number, because the mean of its divisors is an integer number (5012776188).

Almost surely, 2^20011320311 is an apocalyptic number.

20011320311 is a deficient number, since it is larger than the sum of its proper divisors (39784441).

20011320311 is an equidigital number, since it uses as much as digits as its factorization.

20011320311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39784440.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 20011320311 its reverse (11302311002), we get a palindrome (31313631313).

The spelling of 20011320311 in words is "twenty billion, eleven million, three hundred twenty thousand, three hundred eleven".