20679198641 has 4 divisors (see below), whose sum is σ = 20883943284. Its totient is φ = 20474454000.

The previous prime is 20679198619. The next prime is 20679198643. The reversal of 20679198641 is 14689197602.

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 19819008400 + 860190241 = 140780^2 + 29329^2 .

It is a cyclic number.

It is not a de Polignac number, because 20679198641 - 2³⁰ = 19605456817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20679198643) 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, 102372170 + ... + 102372371.

It is an arithmetic number, because the mean of its divisors is an integer number (5220985821).

Almost surely, 2^20679198641 is an apocalyptic number.

It is an amenable number.

20679198641 is a deficient number, since it is larger than the sum of its proper divisors (204744643).

20679198641 is a wasteful number, since it uses less digits than its factorization.

20679198641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204744642.

The product of its (nonzero) digits is 1306368, while the sum is 53.

The spelling of 20679198641 in words is "twenty billion, six hundred seventy-nine million, one hundred ninety-eight thousand, six hundred forty-one".