20017711705 has 4 divisors (see below), whose sum is σ = 24021254052. Its totient is φ = 16014169360.

The previous prime is 20017711699. The next prime is 20017711733. The reversal of 20017711705 is 50711771002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50711771002 = 2 ⋅25355885501.

It can be written as a sum of positive squares in 2 ways, for example, as 5777824144 + 14239887561 = 76012^2 + 119331^2 .

It is not a de Polignac number, because 20017711705 - 2⁷ = 20017711577 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2001771166 + ... + 2001771175.

It is an arithmetic number, because the mean of its divisors is an integer number (6005313513).

Almost surely, 2^20017711705 is an apocalyptic number.

It is an amenable number.

20017711705 is a deficient number, since it is larger than the sum of its proper divisors (4003542347).

20017711705 is an equidigital number, since it uses as much as digits as its factorization.

20017711705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4003542346.

The product of its (nonzero) digits is 3430, while the sum is 31.

The spelling of 20017711705 in words is "twenty billion, seventeen million, seven hundred eleven thousand, seven hundred five".