20819833682 has 18 divisors (see below), whose sum is σ = 31430910447. Its totient is φ = 10343291904.

The previous prime is 20819833681. The next prime is 20819833691. The reversal of 20819833682 is 28633891802.

It can be written as a sum of positive squares in 5 ways, for example, as 20770286161 + 49547521 = 144119^2 + 7039^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=102029.

It is a super-2 number, since 2×20819833682² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20819833682.

It is not an unprimeable number, because it can be changed into a prime (20819833681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 52442708 + ... + 52443104.

Almost surely, 2^20819833682 is an apocalyptic number.

20819833682 is a deficient number, since it is larger than the sum of its proper divisors (10611076765).

20819833682 is an frugal number, since it uses more digits than its factorization.

20819833682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1310 (or 656 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 50.

Multiplying 20819833682 by its sum of digits (50), we get a square (1040991684100 = 1020290²).

The spelling of 20819833682 in words is "twenty billion, eight hundred nineteen million, eight hundred thirty-three thousand, six hundred eighty-two".