20065679 has 4 divisors (see below), whose sum is σ = 20079384. Its totient is φ = 20051976.

The previous prime is 20065657. The next prime is 20065733. The reversal of 20065679 is 97656002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20065679 - 2¹² = 20061583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20065609) 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 3 ways as a sum of consecutive naturals, for example, 4352 + ... + 7685.

It is an arithmetic number, because the mean of its divisors is an integer number (5019846).

Almost surely, 2^20065679 is an apocalyptic number.

20065679 is a deficient number, since it is larger than the sum of its proper divisors (13705).

20065679 is a wasteful number, since it uses less digits than its factorization.

20065679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13704.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 20065679 is about 4479.4730716905. The cubic root of 20065679 is about 271.7385707186.

The spelling of 20065679 in words is "twenty million, sixty-five thousand, six hundred seventy-nine".