20200993 has 2 divisors, whose sum is σ = 20200994. Its totient is φ = 20200992.

The previous prime is 20200979. The next prime is 20201021. The reversal of 20200993 is 39900202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19820304 + 380689 = 4452^2 + 617^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20200993 is a prime.

It is not a weakly prime, because it can be changed into another prime (20200903) 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, 10100496 + 10100497.

It is an arithmetic number, because the mean of its divisors is an integer number (10100497).

Almost surely, 2^20200993 is an apocalyptic number.

It is an amenable number.

20200993 is a deficient number, since it is larger than the sum of its proper divisors (1).

20200993 is an equidigital number, since it uses as much as digits as its factorization.

20200993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 20200993 is about 4494.5514792913. The cubic root of 20200993 is about 272.3480307432.

The spelling of 20200993 in words is "twenty million, two hundred thousand, nine hundred ninety-three".