20321017 has 4 divisors (see below), whose sum is σ = 20362896. Its totient is φ = 20279140.

The previous prime is 20321011. The next prime is 20321023. The reversal of 20321017 is 71012302.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 71012302 = 2 ⋅35506151.

It is an interprime number because it is at equal distance from previous prime (20321011) and next prime (20321023).

It is a cyclic number.

It is not a de Polignac number, because 20321017 - 2³ = 20321009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20321011) 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, 20203 + ... + 21184.

It is an arithmetic number, because the mean of its divisors is an integer number (5090724).

Almost surely, 2^20321017 is an apocalyptic number.

It is an amenable number.

20321017 is a deficient number, since it is larger than the sum of its proper divisors (41879).

20321017 is an equidigital number, since it uses as much as digits as its factorization.

20321017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41878.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 20321017 is about 4507.8838716187. The cubic root of 20321017 is about 272.8863503829.

Adding to 20321017 its reverse (71012302), we get a palindrome (91333319).

The spelling of 20321017 in words is "twenty million, three hundred twenty-one thousand, seventeen".