20431304131 has 8 divisors (see below), whose sum is σ = 23919575904. Its totient is φ = 17085410880.

The previous prime is 20431304129. The next prime is 20431304147. The reversal of 20431304131 is 13140313402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20431304131 - 2¹ = 20431304129 is a prime.

It is a super-2 number, since 2×20431304131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20431304111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35594320 + ... + 35594893.

It is an arithmetic number, because the mean of its divisors is an integer number (2989946988).

Almost surely, 2^20431304131 is an apocalyptic number.

20431304131 is a deficient number, since it is larger than the sum of its proper divisors (3488271773).

20431304131 is an equidigital number, since it uses as much as digits as its factorization.

20431304131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71189261.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 20431304131 its reverse (13140313402), we get a palindrome (33571617533).

The spelling of 20431304131 in words is "twenty billion, four hundred thirty-one million, three hundred four thousand, one hundred thirty-one".