20100320804864 has 60 divisors (see below), whose sum is σ = 40613844951204. Its totient is φ = 9946549714944.

The previous prime is 20100320804843. The next prime is 20100320804869. The reversal of 20100320804864 is 46840802300102.

It can be written as a sum of positive squares in 2 ways, for example, as 3693284491264 + 16407036313600 = 1921792^2 + 4050560^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100320804869) 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, 4734599 + ... + 7913094.

Almost surely, 2^{20100320804864} is an apocalyptic number.

It is an amenable number.

20100320804864 is an abundant number, since it is smaller than the sum of its proper divisors (20513524146340).

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

20100320804864 is an frugal number, since it uses more digits than its factorization.

20100320804864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12647818 (or 12647792 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 38.

The spelling of 20100320804864 in words is "twenty trillion, one hundred billion, three hundred twenty million, eight hundred four thousand, eight hundred sixty-four".