20514361656431 has 4 divisors (see below), whose sum is σ = 20604733293912. Its totient is φ = 20423990018952.

The previous prime is 20514361656427. The next prime is 20514361656443. The reversal of 20514361656431 is 13465616341502.

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 20514361656431 - 2² = 20514361656427 is a prime.

It is a super-2 number, since 2×20514361656431² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20514361656331) 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, 45185818400 + ... + 45185818853.

It is an arithmetic number, because the mean of its divisors is an integer number (5151183323478).

Almost surely, 2^{20514361656431} is an apocalyptic number.

20514361656431 is a deficient number, since it is larger than the sum of its proper divisors (90371637481).

20514361656431 is an equidigital number, since it uses as much as digits as its factorization.

20514361656431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90371637480.

The product of its (nonzero) digits is 1555200, while the sum is 47.

Adding to 20514361656431 its reverse (13465616341502), we get a palindrome (33979977997933).

The spelling of 20514361656431 in words is "twenty trillion, five hundred fourteen billion, three hundred sixty-one million, six hundred fifty-six thousand, four hundred thirty-one".