20321003 has 2 divisors, whose sum is σ = 20321004. Its totient is φ = 20321002.

The previous prime is 20320999. The next prime is 20321009. The reversal of 20321003 is 30012302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20321003 - 2² = 20320999 is a prime.

It is not a weakly prime, because it can be changed into another prime (20321009) 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, 10160501 + 10160502.

It is an arithmetic number, because the mean of its divisors is an integer number (10160502).

Almost surely, 2^20321003 is an apocalyptic number.

20321003 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321003 is an equidigital number, since it uses as much as digits as its factorization.

20321003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 11.

The square root of 20321003 is about 4507.8823187834. The cubic root of 20321003 is about 272.8862877153.

Adding to 20321003 its reverse (30012302), we get a palindrome (50333305).

The spelling of 20321003 in words is "twenty million, three hundred twenty-one thousand, three".