20936589 has 8 divisors (see below), whose sum is σ = 27987360. Its totient is φ = 13921776.

The previous prime is 20936581. The next prime is 20936677. The reversal of 20936589 is 98563902.

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

It is not a de Polignac number, because 20936589 - 2³ = 20936581 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20936589.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20936581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7599 + ... + 9980.

It is an arithmetic number, because the mean of its divisors is an integer number (3498420).

Almost surely, 2^20936589 is an apocalyptic number.

It is an amenable number.

20936589 is a deficient number, since it is larger than the sum of its proper divisors (7050771).

20936589 is a wasteful number, since it uses less digits than its factorization.

20936589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17979.

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

The square root of 20936589 is about 4575.6517568539. The cubic root of 20936589 is about 275.6144453772.

The spelling of 20936589 in words is "twenty million, nine hundred thirty-six thousand, five hundred eighty-nine".