20171066705 has 16 divisors (see below), whose sum is σ = 24884788224. Its totient is φ = 15684736320.

The previous prime is 20171066647. The next prime is 20171066731. The reversal of 20171066705 is 50766017102.

It is not a de Polignac number, because 20171066705 - 2⁸ = 20171066449 is a prime.

It is a Duffinian 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, 128324 + ... + 238346.

It is an arithmetic number, because the mean of its divisors is an integer number (1555299264).

Almost surely, 2^20171066705 is an apocalyptic number.

It is an amenable number.

20171066705 is a deficient number, since it is larger than the sum of its proper divisors (4713721519).

20171066705 is a wasteful number, since it uses less digits than its factorization.

20171066705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111056.

The product of its (nonzero) digits is 17640, while the sum is 35.

The spelling of 20171066705 in words is "twenty billion, one hundred seventy-one million, sixty-six thousand, seven hundred five".