20004111431 has 4 divisors (see below), whose sum is σ = 20004435864. Its totient is φ = 20003787000.

The previous prime is 20004111419. The next prime is 20004111473. The reversal of 20004111431 is 13411140002.

It is a happy number.

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-20004111431 is a prime.

It is a super-2 number, since 2×20004111431² (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 (20004111331) 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, 38045 + ... + 203606.

It is an arithmetic number, because the mean of its divisors is an integer number (5001108966).

Almost surely, 2^20004111431 is an apocalyptic number.

20004111431 is a deficient number, since it is larger than the sum of its proper divisors (324433).

20004111431 is an equidigital number, since it uses as much as digits as its factorization.

20004111431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324432.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20004111431 its reverse (13411140002), we get a palindrome (33415251433).

The spelling of 20004111431 in words is "twenty billion, four million, one hundred eleven thousand, four hundred thirty-one".