20255771 has 2 divisors, whose sum is σ = 20255772. Its totient is φ = 20255770.

The previous prime is 20255743. The next prime is 20255773. The reversal of 20255771 is 17755202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20255771 - 2¹⁰ = 20254747 is a prime.

Together with 20255773, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20255773) 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, 10127885 + 10127886.

It is an arithmetic number, because the mean of its divisors is an integer number (10127886).

Almost surely, 2^20255771 is an apocalyptic number.

20255771 is a deficient number, since it is larger than the sum of its proper divisors (1).

20255771 is an equidigital number, since it uses as much as digits as its factorization.

20255771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4900, while the sum is 29.

The square root of 20255771 is about 4500.6411765436. The cubic root of 20255771 is about 272.5939793123.

The spelling of 20255771 in words is "twenty million, two hundred fifty-five thousand, seven hundred seventy-one".