20873589 has 12 divisors (see below), whose sum is σ = 30592128. Its totient is φ = 12650440.

The previous prime is 20873563. The next prime is 20873599. The reversal of 20873589 is 98537802.

It is not a de Polignac number, because 20873589 - 2¹² = 20869493 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20873589.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20873519) 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 11 ways as a sum of consecutive naturals, for example, 28389 + ... + 29114.

It is an arithmetic number, because the mean of its divisors is an integer number (2549344).

Almost surely, 2^20873589 is an apocalyptic number.

It is an amenable number.

20873589 is a deficient number, since it is larger than the sum of its proper divisors (9718539).

20873589 is a wasteful number, since it uses less digits than its factorization.

20873589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57528 (or 57517 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 20873589 is about 4568.7623050450. The cubic root of 20873589 is about 275.3377184227.

The spelling of 20873589 in words is "twenty million, eight hundred seventy-three thousand, five hundred eighty-nine".