20404031411 has 4 divisors (see below), whose sum is σ = 20415225792. Its totient is φ = 20392837032.

The previous prime is 20404031393. The next prime is 20404031489. The reversal of 20404031411 is 11413040402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20404031411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20404031491) 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, 5594456 + ... + 5598101.

It is an arithmetic number, because the mean of its divisors is an integer number (5103806448).

Almost surely, 2^20404031411 is an apocalyptic number.

20404031411 is a deficient number, since it is larger than the sum of its proper divisors (11194381).

20404031411 is a wasteful number, since it uses less digits than its factorization.

20404031411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11194380.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 20404031411 its reverse (11413040402), we get a palindrome (31817071813).

The spelling of 20404031411 in words is "twenty billion, four hundred four million, thirty-one thousand, four hundred eleven".