20017289 has 8 divisors (see below), whose sum is σ = 20739072. Its totient is φ = 19300320.

The previous prime is 20017247. The next prime is 20017301. The reversal of 20017289 is 98271002.

It is a happy number.

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 20017289 - 2¹² = 20013193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20017229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8672 + ... + 10734.

It is an arithmetic number, because the mean of its divisors is an integer number (2592384).

Almost surely, 2^20017289 is an apocalyptic number.

It is an amenable number.

20017289 is a deficient number, since it is larger than the sum of its proper divisors (721783).

20017289 is a wasteful number, since it uses less digits than its factorization.

20017289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2407.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 20017289 is about 4474.0685064044. The cubic root of 20017289 is about 271.5199550760.

The spelling of 20017289 in words is "twenty million, seventeen thousand, two hundred eighty-nine".