20396289 has 4 divisors (see below), whose sum is σ = 27195056. Its totient is φ = 13597524.

The previous prime is 20396281. The next prime is 20396297. The reversal of 20396289 is 98269302.

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 an interprime number because it is at equal distance from previous prime (20396281) and next prime (20396297).

It is not a de Polignac number, because 20396289 - 2³ = 20396281 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20396281) 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 3 ways as a sum of consecutive naturals, for example, 3399379 + ... + 3399384.

It is an arithmetic number, because the mean of its divisors is an integer number (6798764).

Almost surely, 2^20396289 is an apocalyptic number.

It is an amenable number.

20396289 is a deficient number, since it is larger than the sum of its proper divisors (6798767).

20396289 is an equidigital number, since it uses as much as digits as its factorization.

20396289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6798766.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 20396289 is about 4516.2250829648. The cubic root of 20396289 is about 273.2228721150. Note that the first 3 decimals are identical.

The spelling of 20396289 in words is "twenty million, three hundred ninety-six thousand, two hundred eighty-nine".