20017671577 has 4 divisors (see below), whose sum is σ = 20105085220. Its totient is φ = 19930257936.

The previous prime is 20017671551. The next prime is 20017671643. The reversal of 20017671577 is 77517671002.

It is a happy number.

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 19109191696 + 908479881 = 138236^2 + 30141^2 .

It is a cyclic number.

It is not a de Polignac number, because 20017671577 - 2¹⁹ = 20017147289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20017671517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43706478 + ... + 43706935.

It is an arithmetic number, because the mean of its divisors is an integer number (5026271305).

Almost surely, 2^20017671577 is an apocalyptic number.

It is an amenable number.

20017671577 is a deficient number, since it is larger than the sum of its proper divisors (87413643).

20017671577 is an equidigital number, since it uses as much as digits as its factorization.

20017671577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87413642.

The product of its (nonzero) digits is 144060, while the sum is 43.

The spelling of 20017671577 in words is "twenty billion, seventeen million, six hundred seventy-one thousand, five hundred seventy-seven".