20431132402313 has 4 divisors (see below), whose sum is σ = 20431153178388. Its totient is φ = 20431111626240.

The previous prime is 20431132402309. The next prime is 20431132402319. The reversal of 20431132402313 is 31320423113402.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14061202529929 + 6369929872384 = 3749827^2 + 2523872^2 .

It is a cyclic number.

It is not a de Polignac number, because 20431132402313 - 2² = 20431132402309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20431132402319) 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, 8835608 + ... + 10905513.

It is an arithmetic number, because the mean of its divisors is an integer number (5107788294597).

Almost surely, 2^{20431132402313} is an apocalyptic number.

It is an amenable number.

20431132402313 is a deficient number, since it is larger than the sum of its proper divisors (20776075).

20431132402313 is a wasteful number, since it uses less digits than its factorization.

20431132402313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20776074.

The product of its (nonzero) digits is 10368, while the sum is 29.

Adding to 20431132402313 its reverse (31320423113402), we get a palindrome (51751555515715).

The spelling of 20431132402313 in words is "twenty trillion, four hundred thirty-one billion, one hundred thirty-two million, four hundred two thousand, three hundred thirteen".