20705884185 has 24 divisors (see below), whose sum is σ = 38538300096. Its totient is φ = 9465546720.

The previous prime is 20705884183. The next prime is 20705884187. The reversal of 20705884185 is 58148850702.

It is an interprime number because it is at equal distance from previous prime (20705884183) and next prime (20705884187).

It is not a de Polignac number, because 20705884185 - 2¹ = 20705884183 is a prime.

It is a super-2 number, since 2×20705884185² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20705884181) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14084901 + ... + 14086370.

It is an arithmetic number, because the mean of its divisors is an integer number (1605762504).

Almost surely, 2^20705884185 is an apocalyptic number.

It is an amenable number.

20705884185 is a deficient number, since it is larger than the sum of its proper divisors (17832415911).

20705884185 is a wasteful number, since it uses less digits than its factorization.

20705884185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28171293 (or 28171286 counting only the distinct ones).

The product of its (nonzero) digits is 716800, while the sum is 48.

The spelling of 20705884185 in words is "twenty billion, seven hundred five million, eight hundred eighty-four thousand, one hundred eighty-five".