20172770605 has 16 divisors (see below), whose sum is σ = 27602923824. Its totient is φ = 14020531200.

The previous prime is 20172770599. The next prime is 20172770617. The reversal of 20172770605 is 50607727102.

It can be written as a sum of positive squares in 8 ways, for example, as 600201001 + 19572569604 = 24499^2 + 139902^2 .

It is not a de Polignac number, because 20172770605 - 2¹⁷ = 20172639533 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 15 ways as a sum of consecutive naturals, for example, 9126846 + ... + 9129055.

It is an arithmetic number, because the mean of its divisors is an integer number (1725182739).

Almost surely, 2^20172770605 is an apocalyptic number.

It is an amenable number.

20172770605 is a deficient number, since it is larger than the sum of its proper divisors (7430153219).

20172770605 is a wasteful number, since it uses less digits than its factorization.

20172770605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18255936.

The product of its (nonzero) digits is 41160, while the sum is 37.

The spelling of 20172770605 in words is "twenty billion, one hundred seventy-two million, seven hundred seventy thousand, six hundred five".