20860684188 has 24 divisors (see below), whose sum is σ = 48797547792. Its totient is φ = 6936044544.

The previous prime is 20860684153. The next prime is 20860684189. The reversal of 20860684188 is 88148606802.

It is a self number, because there is not a number n which added to its sum of digits gives 20860684188.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20860684189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2184645 + ... + 2194172.

It is an arithmetic number, because the mean of its divisors is an integer number (2033231158).

Almost surely, 2^20860684188 is an apocalyptic number.

It is an amenable number.

20860684188 is an abundant number, since it is smaller than the sum of its proper divisors (27936863604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20860684188 is a wasteful number, since it uses less digits than its factorization.

20860684188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4379221 (or 4379219 counting only the distinct ones).

The product of its (nonzero) digits is 1179648, while the sum is 51.

The spelling of 20860684188 in words is "twenty billion, eight hundred sixty million, six hundred eighty-four thousand, one hundred eighty-eight".