20404043231 has 32 divisors (see below), whose sum is σ = 24665630976. Its totient is φ = 16629984000.

The previous prime is 20404043227. The next prime is 20404043237. The reversal of 20404043231 is 13234040402.

It is a cyclic number.

It is not a de Polignac number, because 20404043231 - 2² = 20404043227 is a prime.

It is a super-2 number, since 2×20404043231² (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 = 20404043197 and 20404043206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404043237) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1323236 + ... + 1338566.

It is an arithmetic number, because the mean of its divisors is an integer number (770800968).

Almost surely, 2^20404043231 is an apocalyptic number.

20404043231 is a deficient number, since it is larger than the sum of its proper divisors (4261587745).

20404043231 is a wasteful number, since it uses less digits than its factorization.

20404043231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15623.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 20404043231 its reverse (13234040402), we get a palindrome (33638083633).

The spelling of 20404043231 in words is "twenty billion, four hundred four million, forty-three thousand, two hundred thirty-one".