20604820543 has 4 divisors (see below), whose sum is σ = 20684995200. Its totient is φ = 20524645888.

The previous prime is 20604820531. The next prime is 20604820567. The reversal of 20604820543 is 34502840602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34502840602 = 2 ⋅17251420301.

It is a cyclic number.

It is not a de Polignac number, because 20604820543 - 2¹⁷ = 20604689471 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20604820499 and 20604820508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20604820343) 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, 40086943 + ... + 40087456.

It is an arithmetic number, because the mean of its divisors is an integer number (5171248800).

Almost surely, 2^20604820543 is an apocalyptic number.

20604820543 is a deficient number, since it is larger than the sum of its proper divisors (80174657).

20604820543 is an equidigital number, since it uses as much as digits as its factorization.

20604820543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80174656.

The product of its (nonzero) digits is 46080, while the sum is 34.

The spelling of 20604820543 in words is "twenty billion, six hundred four million, eight hundred twenty thousand, five hundred forty-three".