20389659 has 4 divisors (see below), whose sum is σ = 27186216. Its totient is φ = 13593104.

The previous prime is 20389657. The next prime is 20389667. The reversal of 20389659 is 95698302.

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 20389659 - 2¹ = 20389657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20389659.

It is not an unprimeable number, because it can be changed into a prime (20389657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3398274 + ... + 3398279.

It is an arithmetic number, because the mean of its divisors is an integer number (6796554).

Almost surely, 2^20389659 is an apocalyptic number.

20389659 is a deficient number, since it is larger than the sum of its proper divisors (6796557).

20389659 is an equidigital number, since it uses as much as digits as its factorization.

20389659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6796556.

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 20389659 is about 4515.4910032022. The cubic root of 20389659 is about 273.1932643768.

The spelling of 20389659 in words is "twenty million, three hundred eighty-nine thousand, six hundred fifty-nine".