20808570529 has 4 divisors (see below), whose sum is σ = 20814401200. Its totient is φ = 20802739860.

The previous prime is 20808570481. The next prime is 20808570539. The reversal of 20808570529 is 92507580802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20808570529 - 2³³ = 12218635937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20808570539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2909979 + ... + 2917120.

It is an arithmetic number, because the mean of its divisors is an integer number (5203600300).

Almost surely, 2^20808570529 is an apocalyptic number.

It is an amenable number.

20808570529 is a deficient number, since it is larger than the sum of its proper divisors (5830671).

20808570529 is an equidigital number, since it uses as much as digits as its factorization.

20808570529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5830670.

The product of its (nonzero) digits is 403200, while the sum is 46.

The spelling of 20808570529 in words is "twenty billion, eight hundred eight million, five hundred seventy thousand, five hundred twenty-nine".