20356612504631 has 8 divisors (see below), whose sum is σ = 22875658199520. Its totient is φ = 17973731441952.

The previous prime is 20356612504607. The next prime is 20356612504637. The reversal of 20356612504631 is 13640521665302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20356612504631 is a prime.

It is a super-2 number, since 2×20356612504631² (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 (20356612504637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34041157736 + ... + 34041158333.

It is an arithmetic number, because the mean of its divisors is an integer number (2859457274940).

Almost surely, 2^{20356612504631} is an apocalyptic number.

20356612504631 is a deficient number, since it is larger than the sum of its proper divisors (2519045694889).

20356612504631 is a wasteful number, since it uses less digits than its factorization.

20356612504631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68082316105.

The product of its (nonzero) digits is 777600, while the sum is 44.

The spelling of 20356612504631 in words is "twenty trillion, three hundred fifty-six billion, six hundred twelve million, five hundred four thousand, six hundred thirty-one".