20100257 has 2 divisors, whose sum is σ = 20100258. Its totient is φ = 20100256.

The previous prime is 20100253. The next prime is 20100263. The reversal of 20100257 is 75200102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17172736 + 2927521 = 4144^2 + 1711^2 .

It is a cyclic number.

It is not a de Polignac number, because 20100257 - 2² = 20100253 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20100251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050128 + 10050129.

It is an arithmetic number, because the mean of its divisors is an integer number (10050129).

Almost surely, 2^20100257 is an apocalyptic number.

It is an amenable number.

20100257 is a deficient number, since it is larger than the sum of its proper divisors (1).

20100257 is an equidigital number, since it uses as much as digits as its factorization.

20100257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 20100257 is about 4483.3310161084. The cubic root of 20100257 is about 271.8945714893.

Adding to 20100257 its reverse (75200102), we get a palindrome (95300359).

The spelling of 20100257 in words is "twenty million, one hundred thousand, two hundred fifty-seven".