20143557185 has 8 divisors (see below), whose sum is σ = 24194887080. Its totient is φ = 16099766784.

The previous prime is 20143557163. The next prime is 20143557197. The reversal of 20143557185 is 58175534102.

It is a happy number.

It is a Cunningham number, because it is equal to 141928²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 20143557184 = 1^2 + 141928^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20143557185 - 2⁶ = 20143557121 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 7 ways as a sum of consecutive naturals, for example, 1878992 + ... + 1889681.

It is an arithmetic number, because the mean of its divisors is an integer number (3024360885).

Almost surely, 2^20143557185 is an apocalyptic number.

It is an amenable number.

20143557185 is a deficient number, since it is larger than the sum of its proper divisors (4051329895).

20143557185 is a wasteful number, since it uses less digits than its factorization.

20143557185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3769747.

The product of its (nonzero) digits is 168000, while the sum is 41.

The spelling of 20143557185 in words is "twenty billion, one hundred forty-three million, five hundred fifty-seven thousand, one hundred eighty-five".