20028847105 has 4 divisors (see below), whose sum is σ = 24034616532. Its totient is φ = 16023077680.

The previous prime is 20028847057. The next prime is 20028847183. The reversal of 20028847105 is 50174882002.

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 5469046209 + 14559800896 = 73953^2 + 120664^2 .

It is not a de Polignac number, because 20028847105 - 2²⁹ = 19491976193 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 (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2002884706 + ... + 2002884715.

It is an arithmetic number, because the mean of its divisors is an integer number (6008654133).

Almost surely, 2^20028847105 is an apocalyptic number.

It is an amenable number.

20028847105 is a deficient number, since it is larger than the sum of its proper divisors (4005769427).

20028847105 is an equidigital number, since it uses as much as digits as its factorization.

20028847105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4005769426.

The product of its (nonzero) digits is 35840, while the sum is 37.

The spelling of 20028847105 in words is "twenty billion, twenty-eight million, eight hundred forty-seven thousand, one hundred five".