20013793 has 2 divisors, whose sum is σ = 20013794. Its totient is φ = 20013792.

The previous prime is 20013779. The next prime is 20013809. The reversal of 20013793 is 39731002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17164449 + 2849344 = 4143^2 + 1688^2 .

It is a cyclic number.

It is not a de Polignac number, because 20013793 - 2²¹ = 17916641 is a prime.

It is not a weakly prime, because it can be changed into another prime (20013733) 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, 10006896 + 10006897.

It is an arithmetic number, because the mean of its divisors is an integer number (10006897).

Almost surely, 2^20013793 is an apocalyptic number.

It is an amenable number.

20013793 is a deficient number, since it is larger than the sum of its proper divisors (1).

20013793 is an equidigital number, since it uses as much as digits as its factorization.

20013793 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 20013793 is about 4473.6777934938. The cubic root of 20013793 is about 271.5041472573.

Adding to 20013793 its reverse (39731002), we get a palindrome (59744795).

The spelling of 20013793 in words is "twenty million, thirteen thousand, seven hundred ninety-three".