20338870185 has 24 divisors (see below), whose sum is σ = 35355083400. Its totient is φ = 10816307712.

The previous prime is 20338870163. The next prime is 20338870199. The reversal of 20338870185 is 58107883302.

20338870185 is a `hidden beast` number, since 20 + 3 + 388 + 70 + 185 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7706908521 + 12631961664 = 87789^2 + 112392^2 .

It is not a de Polignac number, because 20338870185 - 2²⁴ = 20322092969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 20338870185.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 631824 + ... + 663233.

It is an arithmetic number, because the mean of its divisors is an integer number (1473128475).

Almost surely, 2^20338870185 is an apocalyptic number.

It is an amenable number.

20338870185 is a deficient number, since it is larger than the sum of its proper divisors (15016213215).

20338870185 is a wasteful number, since it uses less digits than its factorization.

20338870185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295417 (or 1295414 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 20338870185 in words is "twenty billion, three hundred thirty-eight million, eight hundred seventy thousand, one hundred eighty-five".