20659884013 has 4 divisors (see below), whose sum is σ = 20679579900. Its totient is φ = 20640188128.

The previous prime is 20659883977. The next prime is 20659884019. The reversal of 20659884013 is 31048895602.

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 12121569604 + 8538314409 = 110098^2 + 92403^2 .

It is a cyclic number.

It is not a de Polignac number, because 20659884013 - 2¹⁷ = 20659752941 is a prime.

It is a super-2 number, since 2×20659884013² (a number of 21 digits) contains 22 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 (20659884019) 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, 9846370 + ... + 9848467.

It is an arithmetic number, because the mean of its divisors is an integer number (5169894975).

Almost surely, 2^20659884013 is an apocalyptic number.

It is an amenable number.

20659884013 is a deficient number, since it is larger than the sum of its proper divisors (19695887).

20659884013 is a wasteful number, since it uses less digits than its factorization.

20659884013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19695886.

The product of its (nonzero) digits is 414720, while the sum is 46.

The spelling of 20659884013 in words is "twenty billion, six hundred fifty-nine million, eight hundred eighty-four thousand, thirteen".