20173206969 has 12 divisors (see below), whose sum is σ = 29166348900. Its totient is φ = 13436217504.

The previous prime is 20173206913. The next prime is 20173206979. The reversal of 20173206969 is 96960237102.

It is a happy number.

20173206969 is a `hidden beast` number, since 201 + 7 + 320 + 69 + 69 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8805382569 + 11367824400 = 93837^2 + 106620^2 .

It is not a de Polignac number, because 20173206969 - 2¹⁵ = 20173174201 is a prime.

It is a super-2 number, since 2×20173206969² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20173206979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1038774 + ... + 1058015.

It is an arithmetic number, because the mean of its divisors is an integer number (2430529075).

Almost surely, 2^20173206969 is an apocalyptic number.

It is an amenable number.

20173206969 is a deficient number, since it is larger than the sum of its proper divisors (8993141931).

20173206969 is a wasteful number, since it uses less digits than its factorization.

20173206969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2097864 (or 2097861 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The spelling of 20173206969 in words is "twenty billion, one hundred seventy-three million, two hundred six thousand, nine hundred sixty-nine".