20085289 has 4 divisors (see below), whose sum is σ = 22954624. Its totient is φ = 17215956.

The previous prime is 20085283. The next prime is 20085319. The reversal of 20085289 is 98258002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98258002 = 2 ⋅49129001.

It is a cyclic number.

It is not a de Polignac number, because 20085289 - 2⁷ = 20085161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20085283) 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, 1434657 + ... + 1434670.

It is an arithmetic number, because the mean of its divisors is an integer number (5738656).

Almost surely, 2^20085289 is an apocalyptic number.

It is an amenable number.

20085289 is a deficient number, since it is larger than the sum of its proper divisors (2869335).

20085289 is an equidigital number, since it uses as much as digits as its factorization.

20085289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2869334.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 20085289 is about 4481.6614106824. The cubic root of 20085289 is about 271.8270644161.

The spelling of 20085289 in words is "twenty million, eighty-five thousand, two hundred eighty-nine".