20286251 has 2 divisors, whose sum is σ = 20286252. Its totient is φ = 20286250.

The previous prime is 20286241. The next prime is 20286257. The reversal of 20286251 is 15268202.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20286251 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20286251.

It is not a weakly prime, because it can be changed into another prime (20286257) 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, 10143125 + 10143126.

It is an arithmetic number, because the mean of its divisors is an integer number (10143126).

Almost surely, 2^20286251 is an apocalyptic number.

20286251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20286251 is an equidigital number, since it uses as much as digits as its factorization.

20286251 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 20286251 is about 4504.0260878463. The cubic root of 20286251 is about 272.7306399618.

The spelling of 20286251 in words is "twenty million, two hundred eighty-six thousand, two hundred fifty-one".