20504938568838 has 16 divisors (see below), whose sum is σ = 41010216288816. Its totient is φ = 6834922997760.

The previous prime is 20504938568831. The next prime is 20504938568861. The reversal of 20504938568838 is 83886583940502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20504938568831) 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, 13341931 + ... + 14799222.

It is an arithmetic number, because the mean of its divisors is an integer number (2563138518051).

Almost surely, 2^{20504938568838} is an apocalyptic number.

20504938568838 is an abundant number, since it is smaller than the sum of its proper divisors (20505277719978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20504938568838 is a wasteful number, since it uses less digits than its factorization.

20504938568838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28262599.

The product of its (nonzero) digits is 398131200, while the sum is 69.

The spelling of 20504938568838 in words is "twenty trillion, five hundred four billion, nine hundred thirty-eight million, five hundred sixty-eight thousand, eight hundred thirty-eight".