20608680613 has 8 divisors (see below), whose sum is σ = 20706802200. Its totient is φ = 20510730240.

The previous prime is 20608680583. The next prime is 20608680629. The reversal of 20608680613 is 31608680602.

It can be written as a sum of positive squares in 4 ways, for example, as 947593089 + 19661087524 = 30783^2 + 140218^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20608680613 - 2²¹ = 20606583461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20608680913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201813 + ... + 286261.

It is an arithmetic number, because the mean of its divisors is an integer number (2588350275).

Almost surely, 2^20608680613 is an apocalyptic number.

It is an amenable number.

20608680613 is a deficient number, since it is larger than the sum of its proper divisors (98121587).

20608680613 is an equidigital number, since it uses as much as digits as its factorization.

20608680613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85607.

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 20608680613 in words is "twenty billion, six hundred eight million, six hundred eighty thousand, six hundred thirteen".