20321013 has 8 divisors (see below), whose sum is σ = 28520800. Its totient is φ = 12834288.

The previous prime is 20321011. The next prime is 20321023. The reversal of 20321013 is 31012302.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20321013 - 2¹ = 20321011 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20321013.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 178198 + ... + 178311.

It is an arithmetic number, because the mean of its divisors is an integer number (3565100).

Almost surely, 2^20321013 is an apocalyptic number.

It is an amenable number.

20321013 is a deficient number, since it is larger than the sum of its proper divisors (8199787).

20321013 is a wasteful number, since it uses less digits than its factorization.

20321013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356531.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 20321013 is about 4507.8834279515. The cubic root of 20321013 is about 272.8863324779.

Adding to 20321013 its reverse (31012302), we get a palindrome (51333315).

The spelling of 20321013 in words is "twenty million, three hundred twenty-one thousand, thirteen".