20975109 has 8 divisors (see below), whose sum is σ = 28048800. Its totient is φ = 13942416.

The previous prime is 20975089. The next prime is 20975117. The reversal of 20975109 is 90157902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20975109 - 2⁸ = 20974853 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20975109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20975509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9034 + ... + 11115.

It is an arithmetic number, because the mean of its divisors is an integer number (3506100).

Almost surely, 2^20975109 is an apocalyptic number.

It is an amenable number.

20975109 is a deficient number, since it is larger than the sum of its proper divisors (7073691).

20975109 is a wasteful number, since it uses less digits than its factorization.

20975109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20499.

The product of its (nonzero) digits is 5670, while the sum is 33.

The square root of 20975109 is about 4579.8590589668. The cubic root of 20975109 is about 275.7833707624.

The spelling of 20975109 in words is "twenty million, nine hundred seventy-five thousand, one hundred nine".