20506562143 has 2 divisors, whose sum is σ = 20506562144. Its totient is φ = 20506562142.

The previous prime is 20506562119. The next prime is 20506562147. The reversal of 20506562143 is 34126560502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20506562143 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20506562099 and 20506562108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20506562147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10253281071 + 10253281072.

It is an arithmetic number, because the mean of its divisors is an integer number (10253281072).

Almost surely, 2^20506562143 is an apocalyptic number.

20506562143 is a deficient number, since it is larger than the sum of its proper divisors (1).

20506562143 is an equidigital number, since it uses as much as digits as its factorization.

20506562143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 34.

The spelling of 20506562143 in words is "twenty billion, five hundred six million, five hundred sixty-two thousand, one hundred forty-three".