20704037 has 2 divisors, whose sum is σ = 20704038. Its totient is φ = 20704036.

The previous prime is 20704007. The next prime is 20704043. The reversal of 20704037 is 73040702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11498881 + 9205156 = 3391^2 + 3034^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20704037 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 (20704007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10352018 + 10352019.

It is an arithmetic number, because the mean of its divisors is an integer number (10352019).

Almost surely, 2^20704037 is an apocalyptic number.

It is an amenable number.

20704037 is a deficient number, since it is larger than the sum of its proper divisors (1).

20704037 is an equidigital number, since it uses as much as digits as its factorization.

20704037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1176, while the sum is 23.

The square root of 20704037 is about 4550.1688979641. The cubic root of 20704037 is about 274.5901862802.

Adding to 20704037 its reverse (73040702), we get a palindrome (93744739).

The spelling of 20704037 in words is "twenty million, seven hundred four thousand, thirty-seven".