20815732159 has 8 divisors (see below), whose sum is σ = 21964819680. Its totient is φ = 19686982656.

The previous prime is 20815732111. The next prime is 20815732177. The reversal of 20815732159 is 95123751802.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20815732159 - 2¹⁷ = 20815601087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20815732459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5082402 + ... + 5086495.

It is an arithmetic number, because the mean of its divisors is an integer number (2745602460).

Almost surely, 2^20815732159 is an apocalyptic number.

20815732159 is a deficient number, since it is larger than the sum of its proper divisors (1149087521).

20815732159 is a wasteful number, since it uses less digits than its factorization.

20815732159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10169009.

The product of its (nonzero) digits is 151200, while the sum is 43.

The spelling of 20815732159 in words is "twenty billion, eight hundred fifteen million, seven hundred thirty-two thousand, one hundred fifty-nine".