20789475805 has 8 divisors (see below), whose sum is σ = 28511281152. Its totient is φ = 14255640528.

The previous prime is 20789475799. The next prime is 20789475809. The reversal of 20789475805 is 50857498702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20789475805 - 2³³ = 12199541213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20789475809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 296992477 + ... + 296992546.

It is an arithmetic number, because the mean of its divisors is an integer number (3563910144).

Almost surely, 2^20789475805 is an apocalyptic number.

It is an amenable number.

20789475805 is a deficient number, since it is larger than the sum of its proper divisors (7721805347).

20789475805 is an equidigital number, since it uses as much as digits as its factorization.

20789475805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593985035.

The product of its (nonzero) digits is 5644800, while the sum is 55.

The spelling of 20789475805 in words is "twenty billion, seven hundred eighty-nine million, four hundred seventy-five thousand, eight hundred five".