20684587071 has 4 divisors (see below), whose sum is σ = 27579449432. Its totient is φ = 13789724712.

The previous prime is 20684587037. The next prime is 20684587093. The reversal of 20684587071 is 17078548602.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20684587071 - 2⁷ = 20684586943 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20684587071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20684587271) 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 3 ways as a sum of consecutive naturals, for example, 3447431176 + ... + 3447431181.

It is an arithmetic number, because the mean of its divisors is an integer number (6894862358).

Almost surely, 2^20684587071 is an apocalyptic number.

20684587071 is a deficient number, since it is larger than the sum of its proper divisors (6894862361).

20684587071 is an equidigital number, since it uses as much as digits as its factorization.

20684587071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6894862360.

The product of its (nonzero) digits is 752640, while the sum is 48.

The spelling of 20684587071 in words is "twenty billion, six hundred eighty-four million, five hundred eighty-seven thousand, seventy-one".