20407685909 has 8 divisors (see below), whose sum is σ = 22305531360. Its totient is φ = 18556700976.

The previous prime is 20407685869. The next prime is 20407685911. The reversal of 20407685909 is 90958670402.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20407685909 - 2⁸ = 20407685653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20407615909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11714219 + ... + 11715960.

It is an arithmetic number, because the mean of its divisors is an integer number (2788191420).

Almost surely, 2^20407685909 is an apocalyptic number.

It is an amenable number.

20407685909 is a deficient number, since it is larger than the sum of its proper divisors (1897845451).

20407685909 is a wasteful number, since it uses less digits than its factorization.

20407685909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23430259.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 20407685909 in words is "twenty billion, four hundred seven million, six hundred eighty-five thousand, nine hundred nine".