20240257 has 2 divisors, whose sum is σ = 20240258. Its totient is φ = 20240256.

The previous prime is 20240219. The next prime is 20240261. The reversal of 20240257 is 75204202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14070001 + 6170256 = 3751^2 + 2484^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20240257 is a prime.

It is not a weakly prime, because it can be changed into another prime (20240267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10120128 + 10120129.

It is an arithmetic number, because the mean of its divisors is an integer number (10120129).

Almost surely, 2^20240257 is an apocalyptic number.

It is an amenable number.

20240257 is a deficient number, since it is larger than the sum of its proper divisors (1).

20240257 is an equidigital number, since it uses as much as digits as its factorization.

20240257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 20240257 is about 4498.9173141991. The cubic root of 20240257 is about 272.5243678234.

Adding to 20240257 its reverse (75204202), we get a palindrome (95444459).

The spelling of 20240257 in words is "twenty million, two hundred forty thousand, two hundred fifty-seven".