20097289 has 3 divisors (see below), whose sum is σ = 20101773. Its totient is φ = 20092806.

The previous prime is 20097263. The next prime is 20097293. The reversal of 20097289 is 98279002.

The square root of 20097289 is 4483.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 20097289 - 2¹⁵ = 20064521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20097299) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2242 + ... + 6724.

It is an arithmetic number, because the mean of its divisors is an integer number (6700591).

Almost surely, 2^20097289 is an apocalyptic number.

20097289 is the 4483-rd square number.

20097289 is the 2242-nd centered octagonal number.

It is an amenable number.

20097289 is a deficient number, since it is larger than the sum of its proper divisors (4484).

20097289 is an frugal number, since it uses more digits than its factorization.

20097289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8966 (or 4483 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 37.

The cubic root of 20097289 is about 271.8811881975.

The spelling of 20097289 in words is "twenty million, ninety-seven thousand, two hundred eighty-nine".