20513131030823 has 16 divisors (see below), whose sum is σ = 22454534337984. Its totient is φ = 18660277670400.

The previous prime is 20513131030793. The next prime is 20513131030849. The reversal of 20513131030823 is 32803013131502.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20513131030823 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20513131030823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20513131030423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107892740 + ... + 108082697.

It is an arithmetic number, because the mean of its divisors is an integer number (1403408396124).

Almost surely, 2^{20513131030823} is an apocalyptic number.

20513131030823 is a deficient number, since it is larger than the sum of its proper divisors (1941403307161).

20513131030823 is a wasteful number, since it uses less digits than its factorization.

20513131030823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215975642.

The product of its (nonzero) digits is 12960, while the sum is 32.

The spelling of 20513131030823 in words is "twenty trillion, five hundred thirteen billion, one hundred thirty-one million, thirty thousand, eight hundred twenty-three".