20793749 has 2 divisors, whose sum is σ = 20793750. Its totient is φ = 20793748.

The previous prime is 20793739. The next prime is 20793781. The reversal of 20793749 is 94739702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18861649 + 1932100 = 4343^2 + 1390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20793749 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20793739) 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, 10396874 + 10396875.

It is an arithmetic number, because the mean of its divisors is an integer number (10396875).

Almost surely, 2^20793749 is an apocalyptic number.

It is an amenable number.

20793749 is a deficient number, since it is larger than the sum of its proper divisors (1).

20793749 is an equidigital number, since it uses as much as digits as its factorization.

20793749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 41.

The square root of 20793749 is about 4560.0163376900. The cubic root of 20793749 is about 274.9862207972.

The spelling of 20793749 in words is "twenty million, seven hundred ninety-three thousand, seven hundred forty-nine".