20740253 has 2 divisors, whose sum is σ = 20740254. Its totient is φ = 20740252.

The previous prime is 20740241. The next prime is 20740259. The reversal of 20740253 is 35204702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14455204 + 6285049 = 3802^2 + 2507^2 .

It is a cyclic number.

It is not a de Polignac number, because 20740253 - 2⁶ = 20740189 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 (20740259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10370126 + 10370127.

It is an arithmetic number, because the mean of its divisors is an integer number (10370127).

Almost surely, 2^20740253 is an apocalyptic number.

It is an amenable number.

20740253 is a deficient number, since it is larger than the sum of its proper divisors (1).

20740253 is an equidigital number, since it uses as much as digits as its factorization.

20740253 is an evil number, because the sum of its binary digits is even.

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

The square root of 20740253 is about 4554.1467916614. The cubic root of 20740253 is about 274.7501996050.

Adding to 20740253 its reverse (35204702), we get a palindrome (55944955).

The spelling of 20740253 in words is "twenty million, seven hundred forty thousand, two hundred fifty-three".