20947159689 has 8 divisors (see below), whose sum is σ = 28312143072. Its totient is φ = 13773474720.

The previous prime is 20947159661. The next prime is 20947159747. The reversal of 20947159689 is 98695174902.

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

It is not a de Polignac number, because 20947159689 - 2¹⁹ = 20946635401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20947159789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47824347 + ... + 47824784.

It is an arithmetic number, because the mean of its divisors is an integer number (3539017884).

Almost surely, 2^20947159689 is an apocalyptic number.

It is an amenable number.

20947159689 is a deficient number, since it is larger than the sum of its proper divisors (7364983383).

20947159689 is an equidigital number, since it uses as much as digits as its factorization.

20947159689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95649207.

The product of its (nonzero) digits is 9797760, while the sum is 60.

The spelling of 20947159689 in words is "twenty billion, nine hundred forty-seven million, one hundred fifty-nine thousand, six hundred eighty-nine".