20512771 has 2 divisors, whose sum is σ = 20512772. Its totient is φ = 20512770.

The previous prime is 20512769. The next prime is 20512841. The reversal of 20512771 is 17721502.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20512771 - 2¹ = 20512769 is a prime.

Together with 20512769, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20512741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10256385 + 10256386.

It is an arithmetic number, because the mean of its divisors is an integer number (10256386).

Almost surely, 2^20512771 is an apocalyptic number.

20512771 is a deficient number, since it is larger than the sum of its proper divisors (1).

20512771 is an equidigital number, since it uses as much as digits as its factorization.

20512771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 20512771 is about 4529.1026705077. The cubic root of 20512771 is about 273.7420050069.

The spelling of 20512771 in words is "twenty million, five hundred twelve thousand, seven hundred seventy-one".