20066659 has 8 divisors (see below), whose sum is σ = 20453472. Its totient is φ = 19682880.

The previous prime is 20066639. The next prime is 20066687. The reversal of 20066659 is 95666002.

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 20066659 - 2¹⁹ = 19542371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20066639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15937 + ... + 17149.

It is an arithmetic number, because the mean of its divisors is an integer number (2556684).

Almost surely, 2^20066659 is an apocalyptic number.

20066659 is a deficient number, since it is larger than the sum of its proper divisors (386813).

20066659 is a wasteful number, since it uses less digits than its factorization.

20066659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1517.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 20066659 is about 4479.5824582209. The cubic root of 20066659 is about 271.7429945154.

The spelling of 20066659 in words is "twenty million, sixty-six thousand, six hundred fifty-nine".