20189020185 has 12 divisors (see below), whose sum is σ = 34994301732. Its totient is φ = 10767477408.

The previous prime is 20189020129. The next prime is 20189020211. The reversal of 20189020185 is 58102098102.

It can be written as a sum of positive squares in 2 ways, for example, as 11788747776 + 8400272409 = 108576^2 + 91653^2 .

It is not a de Polignac number, because 20189020185 - 2⁶ = 20189020121 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 224322402 + ... + 224322491.

It is an arithmetic number, because the mean of its divisors is an integer number (2916191811).

Almost surely, 2^20189020185 is an apocalyptic number.

It is an amenable number.

20189020185 is a deficient number, since it is larger than the sum of its proper divisors (14805281547).

20189020185 is a wasteful number, since it uses less digits than its factorization.

20189020185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448644904 (or 448644901 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The spelling of 20189020185 in words is "twenty billion, one hundred eighty-nine million, twenty thousand, one hundred eighty-five".