20740297 has 2 divisors, whose sum is σ = 20740298. Its totient is φ = 20740296.

The previous prime is 20740261. The next prime is 20740351. The reversal of 20740297 is 79204702.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12278016 + 8462281 = 3504^2 + 2909^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20740297 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20740217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10370148 + 10370149.

It is an arithmetic number, because the mean of its divisors is an integer number (10370149).

Almost surely, 2^20740297 is an apocalyptic number.

It is an amenable number.

20740297 is a deficient number, since it is larger than the sum of its proper divisors (1).

20740297 is an equidigital number, since it uses as much as digits as its factorization.

20740297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 20740297 is about 4554.1516224210. The cubic root of 20740297 is about 274.7503938971.

Adding to 20740297 its reverse (79204702), we get a palindrome (99944999).

It can be divided in two parts, 207 and 40297, that added together give a palindrome (40504).

The spelling of 20740297 in words is "twenty million, seven hundred forty thousand, two hundred ninety-seven".