20684174109 has 4 divisors (see below), whose sum is σ = 27578898816. Its totient is φ = 13789449404.

The previous prime is 20684174059. The next prime is 20684174153. The reversal of 20684174109 is 90147148602.

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 20684174109 - 2⁷ = 20684173981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20684174179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3447362349 + ... + 3447362354.

It is an arithmetic number, because the mean of its divisors is an integer number (6894724704).

Almost surely, 2^20684174109 is an apocalyptic number.

It is an amenable number.

20684174109 is a deficient number, since it is larger than the sum of its proper divisors (6894724707).

20684174109 is an equidigital number, since it uses as much as digits as its factorization.

20684174109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6894724706.

The product of its (nonzero) digits is 96768, while the sum is 42.

The spelling of 20684174109 in words is "twenty billion, six hundred eighty-four million, one hundred seventy-four thousand, one hundred nine".