20670171665204 has 24 divisors (see below), whose sum is σ = 36216587219400. Its totient is φ = 10322581766144.

The previous prime is 20670171665203. The next prime is 20670171665323. The reversal of 20670171665204 is 40256617107602.

It can be written as a sum of positive squares in 4 ways, for example, as 9139121517604 + 11531050147600 = 3023098^2 + 3395740^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20670171665201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12046772 + ... + 13655220.

It is an arithmetic number, because the mean of its divisors is an integer number (1509024467475).

Almost surely, 2^{20670171665204} is an apocalyptic number.

It is an amenable number.

20670171665204 is a deficient number, since it is larger than the sum of its proper divisors (15546415554196).

20670171665204 is a wasteful number, since it uses less digits than its factorization.

20670171665204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1612339 (or 1612337 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 47.

The spelling of 20670171665204 in words is "twenty trillion, six hundred seventy billion, one hundred seventy-one million, six hundred sixty-five thousand, two hundred four".