20207289 has 4 divisors (see below), whose sum is σ = 26943056. Its totient is φ = 13471524.

The previous prime is 20207281. The next prime is 20207303. The reversal of 20207289 is 98270202.

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.

It is not a de Polignac number, because 20207289 - 2³ = 20207281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20207281) 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 3 ways as a sum of consecutive naturals, for example, 3367879 + ... + 3367884.

It is an arithmetic number, because the mean of its divisors is an integer number (6735764).

Almost surely, 2^20207289 is an apocalyptic number.

It is an amenable number.

20207289 is a deficient number, since it is larger than the sum of its proper divisors (6735767).

20207289 is an equidigital number, since it uses as much as digits as its factorization.

20207289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6735766.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 20207289 is about 4495.2518283184. The cubic root of 20207289 is about 272.3763218458.

The spelling of 20207289 in words is "twenty million, two hundred seven thousand, two hundred eighty-nine".