20617670213 has 4 divisors (see below), whose sum is σ = 23563051680. Its totient is φ = 17672288748.

The previous prime is 20617670209. The next prime is 20617670219. The reversal of 20617670213 is 31207671602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20617670213 - 2² = 20617670209 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20617670219) 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 3 ways as a sum of consecutive naturals, for example, 1472690723 + ... + 1472690736.

It is an arithmetic number, because the mean of its divisors is an integer number (5890762920).

Almost surely, 2^20617670213 is an apocalyptic number.

It is an amenable number.

20617670213 is a deficient number, since it is larger than the sum of its proper divisors (2945381467).

20617670213 is an equidigital number, since it uses as much as digits as its factorization.

20617670213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2945381466.

The product of its (nonzero) digits is 21168, while the sum is 35.

The spelling of 20617670213 in words is "twenty billion, six hundred seventeen million, six hundred seventy thousand, two hundred thirteen".