20546257 has 2 divisors, whose sum is σ = 20546258. Its totient is φ = 20546256.

The previous prime is 20546237. The next prime is 20546261. The reversal of 20546257 is 75264502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20349121 + 197136 = 4511^2 + 444^2 .

It is a cyclic number.

It is not a de Polignac number, because 20546257 - 2⁷ = 20546129 is a prime.

It is not a weakly prime, because it can be changed into another prime (20546237) 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, 10273128 + 10273129.

It is an arithmetic number, because the mean of its divisors is an integer number (10273129).

Almost surely, 2^20546257 is an apocalyptic number.

It is an amenable number.

20546257 is a deficient number, since it is larger than the sum of its proper divisors (1).

20546257 is an equidigital number, since it uses as much as digits as its factorization.

20546257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 20546257 is about 4532.7979218139. The cubic root of 20546257 is about 273.8908804131.

The spelling of 20546257 in words is "twenty million, five hundred forty-six thousand, two hundred fifty-seven".