20039993 has 2 divisors, whose sum is σ = 20039994. Its totient is φ = 20039992.

The previous prime is 20039983. The next prime is 20040049. The reversal of 20039993 is 39993002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19998784 + 41209 = 4472^2 + 203^2 .

It is a cyclic number.

It is not a de Polignac number, because 20039993 - 2¹⁴ = 20023609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20039933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10019996 + 10019997.

It is an arithmetic number, because the mean of its divisors is an integer number (10019997).

Almost surely, 2^20039993 is an apocalyptic number.

It is an amenable number.

20039993 is a deficient number, since it is larger than the sum of its proper divisors (1).

20039993 is an equidigital number, since it uses as much as digits as its factorization.

20039993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13122, while the sum is 35.

The square root of 20039993 is about 4476.6050752775. The cubic root of 20039993 is about 271.6225707010.

It can be divided in two parts, 2003999 and 3, that added together give a palindrome (2004002).

The spelling of 20039993 in words is "twenty million, thirty-nine thousand, nine hundred ninety-three".