20704253 has 2 divisors, whose sum is σ = 20704254. Its totient is φ = 20704252.

The previous prime is 20704219. The next prime is 20704279. The reversal of 20704253 is 35240702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15784729 + 4919524 = 3973^2 + 2218^2 .

It is a cyclic number.

It is not a de Polignac number, because 20704253 - 2²⁰ = 19655677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20704213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10352126 + 10352127.

It is an arithmetic number, because the mean of its divisors is an integer number (10352127).

Almost surely, 2^20704253 is an apocalyptic number.

It is an amenable number.

20704253 is a deficient number, since it is larger than the sum of its proper divisors (1).

20704253 is an equidigital number, since it uses as much as digits as its factorization.

20704253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 23.

The square root of 20704253 is about 4550.1926332849. The cubic root of 20704253 is about 274.5911411869.

Adding to 20704253 its reverse (35240702), we get a palindrome (55944955).

The spelling of 20704253 in words is "twenty million, seven hundred four thousand, two hundred fifty-three".