20287329 has 4 divisors (see below), whose sum is σ = 27049776. Its totient is φ = 13524884.

The previous prime is 20287313. The next prime is 20287343. The reversal of 20287329 is 92378202.

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 a cyclic number.

It is not a de Polignac number, because 20287329 - 2⁴ = 20287313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20287329.

It is not an unprimeable number, because it can be changed into a prime (20287369) 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, 3381219 + ... + 3381224.

It is an arithmetic number, because the mean of its divisors is an integer number (6762444).

Almost surely, 2^20287329 is an apocalyptic number.

It is an amenable number.

20287329 is a deficient number, since it is larger than the sum of its proper divisors (6762447).

20287329 is an equidigital number, since it uses as much as digits as its factorization.

20287329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6762446.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 20287329 is about 4504.1457569666. The cubic root of 20287329 is about 272.7354707940.

The spelling of 20287329 in words is "twenty million, two hundred eighty-seven thousand, three hundred twenty-nine".