16720381823204 has 18 divisors (see below), whose sum is σ = 30588184331670. Its totient is φ = 7996704349216.

The previous prime is 16720381823191. The next prime is 16720381823209. The reversal of 16720381823204 is 40232818302761.

It can be written as a sum of positive squares in only one way, i.e., 15418957183204 + 1301424640000 = 3926698^2 + 1140800^2 .

It is a super-2 number, since 2×16720381823204² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16720381823209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3950938769 + ... + 3950943000.

Almost surely, 2^{16720381823204} is an apocalyptic number.

It is an amenable number.

16720381823204 is a deficient number, since it is larger than the sum of its proper divisors (13867802508466).

16720381823204 is a wasteful number, since it uses less digits than its factorization.

16720381823204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7901881819 (or 7901881794 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 47.

The spelling of 16720381823204 in words is "sixteen trillion, seven hundred twenty billion, three hundred eighty-one million, eight hundred twenty-three thousand, two hundred four".