20818073 has 2 divisors, whose sum is σ = 20818074. Its totient is φ = 20818072.

The previous prime is 20818009. The next prime is 20818099. The reversal of 20818073 is 37081802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16096144 + 4721929 = 4012^2 + 2173^2 .

It is a cyclic number.

It is not a de Polignac number, because 20818073 - 2⁶ = 20818009 is a prime.

It is not a weakly prime, because it can be changed into another prime (20818373) 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, 10409036 + 10409037.

It is an arithmetic number, because the mean of its divisors is an integer number (10409037).

Almost surely, 2^20818073 is an apocalyptic number.

It is an amenable number.

20818073 is a deficient number, since it is larger than the sum of its proper divisors (1).

20818073 is an equidigital number, since it uses as much as digits as its factorization.

20818073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 20818073 is about 4562.6826538781. The cubic root of 20818073 is about 275.0934029831.

Adding to 20818073 its reverse (37081802), we get a palindrome (57899875).

It can be divided in two parts, 208 and 18073, that added together give a palindrome (18281).

The spelling of 20818073 in words is "twenty million, eight hundred eighteen thousand, seventy-three".