20938449818808 has 48 divisors (see below), whose sum is σ = 56753704800000. Its totient is φ = 6973895185920.

The previous prime is 20938449818807. The next prime is 20938449818827. The reversal of 20938449818808 is 80881894483902.

20938449818808 is a `hidden beast` number, since 2 + 0 + 93 + 8 + 449 + 8 + 18 + 80 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20938449818807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 116327928 + ... + 116507783.

It is an arithmetic number, because the mean of its divisors is an integer number (1182368850000).

Almost surely, 2^{20938449818808} is an apocalyptic number.

It is an amenable number.

20938449818808 is an abundant number, since it is smaller than the sum of its proper divisors (35815254981192).

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

20938449818808 is a wasteful number, since it uses less digits than its factorization.

20938449818808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232836972 (or 232836965 counting only the distinct ones).

The product of its (nonzero) digits is 254803968, while the sum is 72.

The spelling of 20938449818808 in words is "twenty trillion, nine hundred thirty-eight billion, four hundred forty-nine million, eight hundred eighteen thousand, eight hundred eight".