20004749 has 2 divisors, whose sum is σ = 20004750. Its totient is φ = 20004748.

The previous prime is 20004731. The next prime is 20004773. The reversal of 20004749 is 94740002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18361225 + 1643524 = 4285^2 + 1282^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20004749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20004709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10002374 + 10002375.

It is an arithmetic number, because the mean of its divisors is an integer number (10002375).

Almost surely, 2^20004749 is an apocalyptic number.

It is an amenable number.

20004749 is a deficient number, since it is larger than the sum of its proper divisors (1).

20004749 is an equidigital number, since it uses as much as digits as its factorization.

20004749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20004749 is about 4472.6668778258. Note that the first 3 decimals coincide. The cubic root of 20004749 is about 271.4632445746.

The spelling of 20004749 in words is "twenty million, four thousand, seven hundred forty-nine".