20311441331 has 4 divisors (see below), whose sum is σ = 20384768112. Its totient is φ = 20238114552.

The previous prime is 20311441307. The next prime is 20311441357. The reversal of 20311441331 is 13314411302.

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 20311441331 - 2¹⁰ = 20311440307 is a prime.

It is a super-2 number, since 2×20311441331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20311441297 and 20311441306.

It is not an unprimeable number, because it can be changed into a prime (20311441231) 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, 36662975 + ... + 36663528.

It is an arithmetic number, because the mean of its divisors is an integer number (5096192028).

Almost surely, 2^20311441331 is an apocalyptic number.

20311441331 is a deficient number, since it is larger than the sum of its proper divisors (73326781).

20311441331 is an equidigital number, since it uses as much as digits as its factorization.

20311441331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73326780.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 20311441331 its reverse (13314411302), we get a palindrome (33625852633).

The spelling of 20311441331 in words is "twenty billion, three hundred eleven million, four hundred forty-one thousand, three hundred thirty-one".