20542573123819 has 2 divisors, whose sum is σ = 20542573123820. Its totient is φ = 20542573123818.

The previous prime is 20542573123769. The next prime is 20542573123837. The reversal of 20542573123819 is 91832137524502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20542573123819 - 2¹³ = 20542573115627 is a prime.

It is a super-2 number, since 2×20542573123819² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20542573123889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10271286561909 + 10271286561910.

It is an arithmetic number, because the mean of its divisors is an integer number (10271286561910).

Almost surely, 2^{20542573123819} is an apocalyptic number.

20542573123819 is a deficient number, since it is larger than the sum of its proper divisors (1).

20542573123819 is an equidigital number, since it uses as much as digits as its factorization.

20542573123819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3628800, while the sum is 52.

The spelling of 20542573123819 in words is "twenty trillion, five hundred forty-two billion, five hundred seventy-three million, one hundred twenty-three thousand, eight hundred nineteen".