20311223133 has 4 divisors (see below), whose sum is σ = 27081630848. Its totient is φ = 13540815420.

The previous prime is 20311223077. The next prime is 20311223147. The reversal of 20311223133 is 33132211302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20311223133 - 2⁹ = 20311222621 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 (20311223633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3385203853 + ... + 3385203858.

It is an arithmetic number, because the mean of its divisors is an integer number (6770407712).

Almost surely, 2^20311223133 is an apocalyptic number.

It is an amenable number.

20311223133 is a deficient number, since it is larger than the sum of its proper divisors (6770407715).

20311223133 is an equidigital number, since it uses as much as digits as its factorization.

20311223133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6770407714.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 20311223133 its reverse (33132211302), we get a palindrome (53443434435).

The spelling of 20311223133 in words is "twenty billion, three hundred eleven million, two hundred twenty-three thousand, one hundred thirty-three".