20255161 has 2 divisors, whose sum is σ = 20255162. Its totient is φ = 20255160.

The previous prime is 20255153. The next prime is 20255171. The reversal of 20255161 is 16155202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10989225 + 9265936 = 3315^2 + 3044^2 .

It is a cyclic number.

It is not a de Polignac number, because 20255161 - 2³ = 20255153 is a prime.

It is not a weakly prime, because it can be changed into another prime (20255171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10127580 + 10127581.

It is an arithmetic number, because the mean of its divisors is an integer number (10127581).

Almost surely, 2^20255161 is an apocalyptic number.

It is an amenable number.

20255161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20255161 is an equidigital number, since it uses as much as digits as its factorization.

20255161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 20255161 is about 4500.5734079115. The cubic root of 20255161 is about 272.5912429070.

The spelling of 20255161 in words is "twenty million, two hundred fifty-five thousand, one hundred sixty-one".