20268251 has 2 divisors, whose sum is σ = 20268252. Its totient is φ = 20268250.

The previous prime is 20268239. The next prime is 20268253. The reversal of 20268251 is 15286202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20268251 - 2¹⁰ = 20267227 is a prime.

Together with 20268253, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20268251.

It is not a weakly prime, because it can be changed into another prime (20268253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10134125 + 10134126.

It is an arithmetic number, because the mean of its divisors is an integer number (10134126).

Almost surely, 2^20268251 is an apocalyptic number.

20268251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20268251 is an equidigital number, since it uses as much as digits as its factorization.

20268251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 20268251 is about 4502.0274321688. The cubic root of 20268251 is about 272.6499514173.

The spelling of 20268251 in words is "twenty million, two hundred sixty-eight thousand, two hundred fifty-one".