20036321 has 2 divisors, whose sum is σ = 20036322. Its totient is φ = 20036320.

The previous prime is 20036309. The next prime is 20036329. The reversal of 20036321 is 12363002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15366400 + 4669921 = 3920^2 + 2161^2 .

It is a cyclic number.

It is not a de Polignac number, because 20036321 - 2⁶ = 20036257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20036321.

It is not a weakly prime, because it can be changed into another prime (20036329) 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 as a sum of consecutive naturals, namely, 10018160 + 10018161.

It is an arithmetic number, because the mean of its divisors is an integer number (10018161).

Almost surely, 2^20036321 is an apocalyptic number.

It is an amenable number.

20036321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20036321 is an equidigital number, since it uses as much as digits as its factorization.

20036321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 20036321 is about 4476.1949242632. The cubic root of 20036321 is about 271.6059795607.

Adding to 20036321 its reverse (12363002), we get a palindrome (32399323).

The spelling of 20036321 in words is "twenty million, thirty-six thousand, three hundred twenty-one".