20313511644631 has 4 divisors (see below), whose sum is σ = 20314526173552. Its totient is φ = 20312497115712.

The previous prime is 20313511644617. The next prime is 20313511644719. The reversal of 20313511644631 is 13644611531302.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20313511644631 is a prime.

It is a super-2 number, since 2×20313511644631² (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 (20313511644031) 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, 507234426 + ... + 507274471.

It is an arithmetic number, because the mean of its divisors is an integer number (5078631543388).

Almost surely, 2^{20313511644631} is an apocalyptic number.

20313511644631 is a deficient number, since it is larger than the sum of its proper divisors (1014528921).

20313511644631 is a wasteful number, since it uses less digits than its factorization.

20313511644631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014528920.

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 20313511644631 in words is "twenty trillion, three hundred thirteen billion, five hundred eleven million, six hundred forty-four thousand, six hundred thirty-one".