20047715305 has 4 divisors (see below), whose sum is σ = 24057258372. Its totient is φ = 16038172240.

The previous prime is 20047715299. The next prime is 20047715321. The reversal of 20047715305 is 50351774002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50351774002 = 2 ⋅25175887001.

It can be written as a sum of positive squares in 2 ways, for example, as 2268426384 + 17779288921 = 47628^2 + 133339^2 .

It is not a de Polignac number, because 20047715305 - 2³ = 20047715297 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2004771526 + ... + 2004771535.

It is an arithmetic number, because the mean of its divisors is an integer number (6014314593).

Almost surely, 2^20047715305 is an apocalyptic number.

It is an amenable number.

20047715305 is a deficient number, since it is larger than the sum of its proper divisors (4009543067).

20047715305 is an equidigital number, since it uses as much as digits as its factorization.

20047715305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4009543066.

The product of its (nonzero) digits is 29400, while the sum is 34.

The spelling of 20047715305 in words is "twenty billion, forty-seven million, seven hundred fifteen thousand, three hundred five".