20579697871 has 8 divisors (see below), whose sum is σ = 21800867904. Its totient is φ = 19359705600.

The previous prime is 20579697863. The next prime is 20579697947. The reversal of 20579697871 is 17879697502.

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 20579697871 - 2³ = 20579697863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20579697821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258330 + ... + 328471.

It is an arithmetic number, because the mean of its divisors is an integer number (2725108488).

Almost surely, 2^20579697871 is an apocalyptic number.

20579697871 is a deficient number, since it is larger than the sum of its proper divisors (1221170033).

20579697871 is a wasteful number, since it uses less digits than its factorization.

20579697871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588881.

The product of its (nonzero) digits is 13335840, while the sum is 61.

The spelling of 20579697871 in words is "twenty billion, five hundred seventy-nine million, six hundred ninety-seven thousand, eight hundred seventy-one".