20007749 has 2 divisors, whose sum is σ = 20007750. Its totient is φ = 20007748.

The previous prime is 20007737. The next prime is 20007773. The reversal of 20007749 is 94770002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19492225 + 515524 = 4415^2 + 718^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20007749 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20007719) 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, 10003874 + 10003875.

It is an arithmetic number, because the mean of its divisors is an integer number (10003875).

Almost surely, 2^20007749 is an apocalyptic number.

It is an amenable number.

20007749 is a deficient number, since it is larger than the sum of its proper divisors (1).

20007749 is an equidigital number, since it uses as much as digits as its factorization.

20007749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 20007749 is about 4473.0022356355. The cubic root of 20007749 is about 271.4768138364.

The spelling of 20007749 in words is "twenty million, seven thousand, seven hundred forty-nine".