20543350143 has 4 divisors (see below), whose sum is σ = 27391133528. Its totient is φ = 13695566760.

The previous prime is 20543350141. The next prime is 20543350159. The reversal of 20543350143 is 34105334502.

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

It is not a de Polignac number, because 20543350143 - 2¹ = 20543350141 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20543350143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20543350141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3423891688 + ... + 3423891693.

It is an arithmetic number, because the mean of its divisors is an integer number (6847783382).

Almost surely, 2^20543350143 is an apocalyptic number.

20543350143 is a deficient number, since it is larger than the sum of its proper divisors (6847783385).

20543350143 is an equidigital number, since it uses as much as digits as its factorization.

20543350143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6847783384.

The product of its (nonzero) digits is 21600, while the sum is 30.

Adding to 20543350143 its reverse (34105334502), we get a palindrome (54648684645).

The spelling of 20543350143 in words is "twenty billion, five hundred forty-three million, three hundred fifty thousand, one hundred forty-three".