20286257 has 2 divisors, whose sum is σ = 20286258. Its totient is φ = 20286256.

The previous prime is 20286251. The next prime is 20286263. The reversal of 20286257 is 75268202.

It is a balanced prime because it is at equal distance from previous prime (20286251) and next prime (20286263).

It can be written as a sum of positive squares in only one way, i.e., 15689521 + 4596736 = 3961^2 + 2144^2 .

It is a cyclic number.

It is not a de Polignac number, because 20286257 - 2⁴ = 20286241 is a prime.

It is not a weakly prime, because it can be changed into another prime (20286251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10143128 + 10143129.

It is an arithmetic number, because the mean of its divisors is an integer number (10143129).

Almost surely, 2^20286257 is an apocalyptic number.

It is an amenable number.

20286257 is a deficient number, since it is larger than the sum of its proper divisors (1).

20286257 is an equidigital number, since it uses as much as digits as its factorization.

20286257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 20286257 is about 4504.0267539170. The cubic root of 20286257 is about 272.7306668500.

The spelling of 20286257 in words is "twenty million, two hundred eighty-six thousand, two hundred fifty-seven".