20854889 has 8 divisors (see below), whose sum is σ = 23091168. Its totient is φ = 18675360.

The previous prime is 20854853. The next prime is 20854891. The reversal of 20854889 is 98845802.

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

It is not a de Polignac number, because 20854889 - 2¹² = 20850793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20854849) 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 7 ways as a sum of consecutive naturals, for example, 13412 + ... + 14885.

It is an arithmetic number, because the mean of its divisors is an integer number (2886396).

Almost surely, 2^20854889 is an apocalyptic number.

It is an amenable number.

20854889 is a deficient number, since it is larger than the sum of its proper divisors (2236279).

20854889 is a wasteful number, since it uses less digits than its factorization.

20854889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28375.

The product of its (nonzero) digits is 184320, while the sum is 44.

The square root of 20854889 is about 4566.7153403732. The cubic root of 20854889 is about 275.2554716873.

The spelling of 20854889 in words is "twenty million, eight hundred fifty-four thousand, eight hundred eighty-nine".