20265121 has 2 divisors, whose sum is σ = 20265122. Its totient is φ = 20265120.

The previous prime is 20265067. The next prime is 20265137. The reversal of 20265121 is 12156202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13608721 + 6656400 = 3689^2 + 2580^2 .

It is a cyclic number.

It is not a de Polignac number, because 20265121 - 2⁹ = 20264609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20265151) 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, 10132560 + 10132561.

It is an arithmetic number, because the mean of its divisors is an integer number (10132561).

Almost surely, 2^20265121 is an apocalyptic number.

It is an amenable number.

20265121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20265121 is an equidigital number, since it uses as much as digits as its factorization.

20265121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 20265121 is about 4501.6797975867. The cubic root of 20265121 is about 272.6359157007.

The spelling of 20265121 in words is "twenty million, two hundred sixty-five thousand, one hundred twenty-one".