20156216185 has 8 divisors (see below), whose sum is σ = 27642810816. Its totient is φ = 13821405360.

The previous prime is 20156216147. The next prime is 20156216239. The reversal of 20156216185 is 58161265102.

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

It is not a de Polignac number, because 20156216185 - 2¹³ = 20156207993 is a prime.

It is a Duffinian 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, 287945911 + ... + 287945980.

It is an arithmetic number, because the mean of its divisors is an integer number (3455351352).

Almost surely, 2^20156216185 is an apocalyptic number.

It is an amenable number.

20156216185 is a deficient number, since it is larger than the sum of its proper divisors (7486594631).

20156216185 is an equidigital number, since it uses as much as digits as its factorization.

20156216185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575891903.

The product of its (nonzero) digits is 28800, while the sum is 37.

The spelling of 20156216185 in words is "twenty billion, one hundred fifty-six million, two hundred sixteen thousand, one hundred eighty-five".