20517203543 has 2 divisors, whose sum is σ = 20517203544. Its totient is φ = 20517203542.

The previous prime is 20517203471. The next prime is 20517203563. The reversal of 20517203543 is 34530271502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20517203543 - 2¹² = 20517199447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20517203563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10258601771 + 10258601772.

It is an arithmetic number, because the mean of its divisors is an integer number (10258601772).

Almost surely, 2^20517203543 is an apocalyptic number.

20517203543 is a deficient number, since it is larger than the sum of its proper divisors (1).

20517203543 is an equidigital number, since it uses as much as digits as its factorization.

20517203543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 32.

The spelling of 20517203543 in words is "twenty billion, five hundred seventeen million, two hundred three thousand, five hundred forty-three".