20873185 has 8 divisors (see below), whose sum is σ = 25911720. Its totient is φ = 16122624.

The previous prime is 20873159. The next prime is 20873207. The reversal of 20873185 is 58137802.

It can be written as a sum of positive squares in 4 ways, for example, as 6561 + 20866624 = 81^2 + 4568^2 .

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 20873185 - 2¹³ = 20864993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20873185.

It is an unprimeable number.

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, 71832 + ... + 72121.

It is an arithmetic number, because the mean of its divisors is an integer number (3238965).

Almost surely, 2^20873185 is an apocalyptic number.

It is an amenable number.

20873185 is a deficient number, since it is larger than the sum of its proper divisors (5038535).

20873185 is a wasteful number, since it uses less digits than its factorization.

20873185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143987.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 20873185 is about 4568.7180915438. The cubic root of 20873185 is about 275.3359420606.

The spelling of 20873185 in words is "twenty million, eight hundred seventy-three thousand, one hundred eighty-five".