20871059285 has 8 divisors (see below), whose sum is σ = 25046694456. Its totient is φ = 16695898560.

The previous prime is 20871059269. The next prime is 20871059311. The reversal of 20871059285 is 58295017802.

It can be written as a sum of positive squares in 4 ways, for example, as 5742305284 + 15128754001 = 75778^2 + 122999^2 .

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

It is not a de Polignac number, because 20871059285 - 2⁴ = 20871059269 is a prime.

It is a super-2 number, since 2×20871059285² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13334 + ... + 204743.

It is an arithmetic number, because the mean of its divisors is an integer number (3130836807).

Almost surely, 2^20871059285 is an apocalyptic number.

It is an amenable number.

20871059285 is a deficient number, since it is larger than the sum of its proper divisors (4175635171).

20871059285 is a wasteful number, since it uses less digits than its factorization.

20871059285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237223.

The product of its (nonzero) digits is 403200, while the sum is 47.

The spelling of 20871059285 in words is "twenty billion, eight hundred seventy-one million, fifty-nine thousand, two hundred eighty-five".