20288609 has 8 divisors (see below), whose sum is σ = 22220352. Its totient is φ = 18371440.

The previous prime is 20288557. The next prime is 20288621. The reversal of 20288609 is 90688202.

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 20288609 - 2²⁰ = 19240033 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20288629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 614 + ... + 6399.

It is an arithmetic number, because the mean of its divisors is an integer number (2777544).

Almost surely, 2^20288609 is an apocalyptic number.

It is an amenable number.

20288609 is a deficient number, since it is larger than the sum of its proper divisors (1931743).

20288609 is a wasteful number, since it uses less digits than its factorization.

20288609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7287.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 20288609 is about 4504.2878460418. The cubic root of 20288609 is about 272.7412066248.

The spelling of 20288609 in words is "twenty million, two hundred eighty-eight thousand, six hundred nine".