20404312133 has 4 divisors (see below), whose sum is σ = 20406033120. Its totient is φ = 20402591148.

The previous prime is 20404312129. The next prime is 20404312151. The reversal of 20404312133 is 33121340402.

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 a cyclic number.

It is not a de Polignac number, because 20404312133 - 2² = 20404312129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20404312099 and 20404312108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404312433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 842585 + ... + 866462.

It is an arithmetic number, because the mean of its divisors is an integer number (5101508280).

Almost surely, 2^20404312133 is an apocalyptic number.

It is an amenable number.

20404312133 is a deficient number, since it is larger than the sum of its proper divisors (1720987).

20404312133 is a wasteful number, since it uses less digits than its factorization.

20404312133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1720986.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 20404312133 its reverse (33121340402), we get a palindrome (53525652535).

The spelling of 20404312133 in words is "twenty billion, four hundred four million, three hundred twelve thousand, one hundred thirty-three".