19794820044769 has 27 divisors (see below), whose sum is σ = 25310697913683. Its totient is φ = 15424268151600.

The previous prime is 19794820044749. The next prime is 19794820044773. The reversal of 19794820044769 is 96744002849791.

The square root of 19794820044769 is 4449137.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 15866575324369 + 3928244720400 = 3983287^2 + 1981980^2 .

It is not a de Polignac number, because 19794820044769 - 2¹¹ = 19794820042721 is a prime.

It is a super-2 number, since 2×19794820044769² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19794820044698 and 19794820044707.

It is not an unprimeable number, because it can be changed into a prime (19794820044749) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 342554659 + ... + 342612439.

Almost surely, 2^{19794820044769} is an apocalyptic number.

19794820044769 is the 4449137-th square number.

19794820044769 is the 2224569-th centered octagonal number.

It is an amenable number.

19794820044769 is a deficient number, since it is larger than the sum of its proper divisors (5515877868914).

19794820044769 is an frugal number, since it uses more digits than its factorization.

19794820044769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115598 (or 57799 counting only the distinct ones).

The product of its (nonzero) digits is 219469824, while the sum is 70.

The spelling of 19794820044769 in words is "nineteen trillion, seven hundred ninety-four billion, eight hundred twenty million, forty-four thousand, seven hundred sixty-nine".