20531052142431 has 4 divisors (see below), whose sum is σ = 27374736189912. Its totient is φ = 13687368094952.

The previous prime is 20531052142427. The next prime is 20531052142463. The reversal of 20531052142431 is 13424125013502.

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 20531052142431 - 2² = 20531052142427 is a prime.

It is a super-3 number, since 3×20531052142431³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 20531052142392 and 20531052142401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20531052142031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3421842023736 + ... + 3421842023741.

It is an arithmetic number, because the mean of its divisors is an integer number (6843684047478).

Almost surely, 2^{20531052142431} is an apocalyptic number.

20531052142431 is a deficient number, since it is larger than the sum of its proper divisors (6843684047481).

20531052142431 is an equidigital number, since it uses as much as digits as its factorization.

20531052142431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6843684047480.

The product of its (nonzero) digits is 28800, while the sum is 33.

Adding to 20531052142431 its reverse (13424125013502), we get a palindrome (33955177155933).

The spelling of 20531052142431 in words is "twenty trillion, five hundred thirty-one billion, fifty-two million, one hundred forty-two thousand, four hundred thirty-one".