20983764706417 has 4 divisors (see below), whose sum is σ = 20983823804020. Its totient is φ = 20983705608816.

The previous prime is 20983764706393. The next prime is 20983764706427. The reversal of 20983764706417 is 71460746738902.

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 5246921659456 + 15736843046961 = 2290616^2 + 3966969^2 .

It is a cyclic number.

It is not a de Polignac number, because 20983764706417 - 2³⁹ = 20434008892529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20983764706427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29012958 + ... + 29727415.

It is an arithmetic number, because the mean of its divisors is an integer number (5245955951005).

Almost surely, 2^{20983764706417} is an apocalyptic number.

It is an amenable number.

20983764706417 is a deficient number, since it is larger than the sum of its proper divisors (59097603).

20983764706417 is an equidigital number, since it uses as much as digits as its factorization.

20983764706417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59097602.

The product of its (nonzero) digits is 85349376, while the sum is 64.

The spelling of 20983764706417 in words is "twenty trillion, nine hundred eighty-three billion, seven hundred sixty-four million, seven hundred six thousand, four hundred seventeen".