20087185133 has 4 divisors (see below), whose sum is σ = 20123248860. Its totient is φ = 20051121408.

The previous prime is 20087185109. The next prime is 20087185169. The reversal of 20087185133 is 33158178002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11535189604 + 8551995529 = 107402^2 + 92477^2 .

It is a cyclic number.

It is not a de Polignac number, because 20087185133 - 2²⁰ = 20086136557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20087185333) 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 3 ways as a sum of consecutive naturals, for example, 18031028 + ... + 18032141.

It is an arithmetic number, because the mean of its divisors is an integer number (5030812215).

Almost surely, 2^20087185133 is an apocalyptic number.

It is an amenable number.

20087185133 is a deficient number, since it is larger than the sum of its proper divisors (36063727).

20087185133 is an equidigital number, since it uses as much as digits as its factorization.

20087185133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36063726.

The product of its (nonzero) digits is 40320, while the sum is 38.

The spelling of 20087185133 in words is "twenty billion, eighty-seven million, one hundred eighty-five thousand, one hundred thirty-three".