20548940905 has 4 divisors (see below), whose sum is σ = 24658729092. Its totient is φ = 16439152720.

The previous prime is 20548940887. The next prime is 20548940911. The reversal of 20548940905 is 50904984502.

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 7872657984 + 12676282921 = 88728^2 + 112589^2 .

It is not a de Polignac number, because 20548940905 - 2⁷ = 20548940777 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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2054894086 + ... + 2054894095.

It is an arithmetic number, because the mean of its divisors is an integer number (6164682273).

Almost surely, 2^20548940905 is an apocalyptic number.

It is an amenable number.

20548940905 is a deficient number, since it is larger than the sum of its proper divisors (4109788187).

20548940905 is an equidigital number, since it uses as much as digits as its factorization.

20548940905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4109788186.

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 20548940905 in words is "twenty billion, five hundred forty-eight million, nine hundred forty thousand, nine hundred five".