20288321 has 8 divisors (see below), whose sum is σ = 21132864. Its totient is φ = 19459440.

The previous prime is 20288299. The next prime is 20288339. The reversal of 20288321 is 12388202.

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 20288321 - 2¹⁰ = 20287297 is a prime.

It is a super-3 number, since 3×20288321³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20288381) 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, 1235 + ... + 6488.

It is an arithmetic number, because the mean of its divisors is an integer number (2641608).

Almost surely, 2^20288321 is an apocalyptic number.

It is an amenable number.

20288321 is a deficient number, since it is larger than the sum of its proper divisors (844543).

20288321 is an equidigital number, since it uses as much as digits as its factorization.

20288321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7831.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 20288321 is about 4504.2558763907. The cubic root of 20288321 is about 272.7399160839.

The spelling of 20288321 in words is "twenty million, two hundred eighty-eight thousand, three hundred twenty-one".