20159871673 has 4 divisors (see below), whose sum is σ = 20205379728. Its totient is φ = 20114363620.

The previous prime is 20159871647. The next prime is 20159871691. The reversal of 20159871673 is 37617895102.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 37617895102 = 2 ⋅18808947551.

It is a cyclic number.

It is not a de Polignac number, because 20159871673 - 2³³ = 11569937081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20159821673) 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, 22753363 + ... + 22754248.

It is an arithmetic number, because the mean of its divisors is an integer number (5051344932).

Almost surely, 2^20159871673 is an apocalyptic number.

It is an amenable number.

20159871673 is a deficient number, since it is larger than the sum of its proper divisors (45508055).

20159871673 is an equidigital number, since it uses as much as digits as its factorization.

20159871673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45508054.

The product of its (nonzero) digits is 635040, while the sum is 49.

The spelling of 20159871673 in words is "twenty billion, one hundred fifty-nine million, eight hundred seventy-one thousand, six hundred seventy-three".