20266871 has 2 divisors, whose sum is σ = 20266872. Its totient is φ = 20266870.

The previous prime is 20266867. The next prime is 20266877. The reversal of 20266871 is 17866202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20266871 - 2² = 20266867 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20266877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10133435 + 10133436.

It is an arithmetic number, because the mean of its divisors is an integer number (10133436).

Almost surely, 2^20266871 is an apocalyptic number.

20266871 is a deficient number, since it is larger than the sum of its proper divisors (1).

20266871 is an equidigital number, since it uses as much as digits as its factorization.

20266871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 20266871 is about 4501.8741652783. The cubic root of 20266871 is about 272.6437633242.

The spelling of 20266871 in words is "twenty million, two hundred sixty-six thousand, eight hundred seventy-one".