20312640243535 has 8 divisors (see below), whose sum is σ = 24386704115760. Its totient is φ = 16242421645824.

The previous prime is 20312640243529. The next prime is 20312640243551. The reversal of 20312640243535 is 53534204621302.

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 20312640243535 - 2³ = 20312640243527 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 961307005 + ... + 961328134.

It is an arithmetic number, because the mean of its divisors is an integer number (3048338014470).

Almost surely, 2^{20312640243535} is an apocalyptic number.

20312640243535 is a deficient number, since it is larger than the sum of its proper divisors (4074063872225).

20312640243535 is a wasteful number, since it uses less digits than its factorization.

20312640243535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1922637257.

The product of its (nonzero) digits is 518400, while the sum is 40.

Adding to 20312640243535 its reverse (53534204621302), we get a palindrome (73846844864837).

The spelling of 20312640243535 in words is "twenty trillion, three hundred twelve billion, six hundred forty million, two hundred forty-three thousand, five hundred thirty-five".