20243310431 has 4 divisors (see below), whose sum is σ = 20372248872. Its totient is φ = 20114371992.

The previous prime is 20243310421. The next prime is 20243310443. The reversal of 20243310431 is 13401334202.

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

It is a cyclic number.

It is not a de Polignac number, because 20243310431 - 2²⁶ = 20176201567 is a prime.

It is a super-2 number, since 2×20243310431² (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 = 20243310397 and 20243310406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20243310421) 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, 64468985 + ... + 64469298.

It is an arithmetic number, because the mean of its divisors is an integer number (5093062218).

Almost surely, 2^20243310431 is an apocalyptic number.

20243310431 is a deficient number, since it is larger than the sum of its proper divisors (128938441).

20243310431 is a wasteful number, since it uses less digits than its factorization.

20243310431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128938440.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 20243310431 its reverse (13401334202), we get a palindrome (33644644633).

The spelling of 20243310431 in words is "twenty billion, two hundred forty-three million, three hundred ten thousand, four hundred thirty-one".