20300993 has 2 divisors, whose sum is σ = 20300994. Its totient is φ = 20300992.

The previous prime is 20300977. The next prime is 20300999. The reversal of 20300993 is 39900302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17032129 + 3268864 = 4127^2 + 1808^2 .

It is a cyclic number.

It is not a de Polignac number, because 20300993 - 2⁴ = 20300977 is a prime.

It is not a weakly prime, because it can be changed into another prime (20300999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10150496 + 10150497.

It is an arithmetic number, because the mean of its divisors is an integer number (10150497).

Almost surely, 2^20300993 is an apocalyptic number.

It is an amenable number.

20300993 is a deficient number, since it is larger than the sum of its proper divisors (1).

20300993 is an equidigital number, since it uses as much as digits as its factorization.

20300993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 26.

The square root of 20300993 is about 4505.6623264510. The cubic root of 20300993 is about 272.7966883339.

The spelling of 20300993 in words is "twenty million, three hundred thousand, nine hundred ninety-three".