20808570539 has 2 divisors, whose sum is σ = 20808570540. Its totient is φ = 20808570538.

The previous prime is 20808570481. The next prime is 20808570547. The reversal of 20808570539 is 93507580802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20808570539 - 2²⁰ = 20807521963 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20808570493 and 20808570502.

It is not a weakly prime, because it can be changed into another prime (20808576539) 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 as a sum of consecutive naturals, namely, 10404285269 + 10404285270.

It is an arithmetic number, because the mean of its divisors is an integer number (10404285270).

Almost surely, 2^20808570539 is an apocalyptic number.

20808570539 is a deficient number, since it is larger than the sum of its proper divisors (1).

20808570539 is an equidigital number, since it uses as much as digits as its factorization.

20808570539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 604800, while the sum is 47.

The spelling of 20808570539 in words is "twenty billion, eight hundred eight million, five hundred seventy thousand, five hundred thirty-nine".