20740605205 has 8 divisors (see below), whose sum is σ = 24889644504. Its totient is φ = 16591872000.

The previous prime is 20740605107. The next prime is 20740605233. The reversal of 20740605205 is 50250604702.

It can be written as a sum of positive squares in 4 ways, for example, as 356190129 + 20384415076 = 18873^2 + 142774^2 .

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

It is not a de Polignac number, because 20740605205 - 2²³ = 20732216597 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 117085 + ... + 234925.

It is an arithmetic number, because the mean of its divisors is an integer number (3111205563).

Almost surely, 2^20740605205 is an apocalyptic number.

It is an amenable number.

20740605205 is a deficient number, since it is larger than the sum of its proper divisors (4149039299).

20740605205 is a wasteful number, since it uses less digits than its factorization.

20740605205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153047.

The product of its (nonzero) digits is 16800, while the sum is 31.

The spelling of 20740605205 in words is "twenty billion, seven hundred forty million, six hundred five thousand, two hundred five".