20547144143 has 4 divisors (see below), whose sum is σ = 20565944088. Its totient is φ = 20528344200.

The previous prime is 20547144091. The next prime is 20547144151. The reversal of 20547144143 is 34144174502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34144174502 = 2 ⋅17072087251.

It is a cyclic number.

It is not a de Polignac number, because 20547144143 - 2¹⁰ = 20547143119 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 (20547144643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9398333 + ... + 9400518.

It is an arithmetic number, because the mean of its divisors is an integer number (5141486022).

Almost surely, 2^20547144143 is an apocalyptic number.

20547144143 is a deficient number, since it is larger than the sum of its proper divisors (18799945).

20547144143 is a wasteful number, since it uses less digits than its factorization.

20547144143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18799944.

The product of its (nonzero) digits is 53760, while the sum is 35.

The spelling of 20547144143 in words is "twenty billion, five hundred forty-seven million, one hundred forty-four thousand, one hundred forty-three".