20740104257 has 2 divisors, whose sum is σ = 20740104258. Its totient is φ = 20740104256.

The previous prime is 20740104239. The next prime is 20740104293. The reversal of 20740104257 is 75240104702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14208878401 + 6531225856 = 119201^2 + 80816^2 .

It is a cyclic number.

It is not a de Polignac number, because 20740104257 - 2¹⁰ = 20740103233 is a prime.

It is not a weakly prime, because it can be changed into another prime (20740104457) 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, 10370052128 + 10370052129.

It is an arithmetic number, because the mean of its divisors is an integer number (10370052129).

Almost surely, 2^20740104257 is an apocalyptic number.

It is an amenable number.

20740104257 is a deficient number, since it is larger than the sum of its proper divisors (1).

20740104257 is an equidigital number, since it uses as much as digits as its factorization.

20740104257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15680, while the sum is 32.

Adding to 20740104257 its reverse (75240104702), we get a palindrome (95980208959).

The spelling of 20740104257 in words is "twenty billion, seven hundred forty million, one hundred four thousand, two hundred fifty-seven".