20808980434933 has 4 divisors (see below), whose sum is σ = 20814292917900. Its totient is φ = 20803667951968.

The previous prime is 20808980434901. The next prime is 20808980434967. The reversal of 20808980434933 is 33943408980802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16030550569489 + 4778429865444 = 4003817^2 + 2185962^2 .

It is a cyclic number.

It is not a de Polignac number, because 20808980434933 - 2⁵ = 20808980434901 is a prime.

It is a super-3 number, since 3×20808980434933³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20808980437933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2656235608 + ... + 2656243441.

It is an arithmetic number, because the mean of its divisors is an integer number (5203573229475).

Almost surely, 2^{20808980434933} is an apocalyptic number.

It is an amenable number.

20808980434933 is a deficient number, since it is larger than the sum of its proper divisors (5312482967).

20808980434933 is an equidigital number, since it uses as much as digits as its factorization.

20808980434933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5312482966.

The product of its (nonzero) digits is 35831808, while the sum is 61.

The spelling of 20808980434933 in words is "twenty trillion, eight hundred eight billion, nine hundred eighty million, four hundred thirty-four thousand, nine hundred thirty-three".