20004606805 has 4 divisors (see below), whose sum is σ = 24005528172. Its totient is φ = 16003685440.

The previous prime is 20004606781. The next prime is 20004606823. The reversal of 20004606805 is 50860640002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7046427249 + 12958179556 = 83943^2 + 113834^2 .

It is not a de Polignac number, because 20004606805 - 2⁵ = 20004606773 is a prime.

It is a super-3 number, since 3×20004606805³ (a number of 32 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2000460676 + ... + 2000460685.

It is an arithmetic number, because the mean of its divisors is an integer number (6001382043).

Almost surely, 2^20004606805 is an apocalyptic number.

It is an amenable number.

20004606805 is a deficient number, since it is larger than the sum of its proper divisors (4000921367).

20004606805 is an equidigital number, since it uses as much as digits as its factorization.

20004606805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4000921366.

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 20004606805 in words is "twenty billion, four million, six hundred six thousand, eight hundred five".