20065257 has 6 divisors (see below), whose sum is σ = 28983162. Its totient is φ = 13376832.

The previous prime is 20065249. The next prime is 20065259. The reversal of 20065257 is 75256002.

20065257 is a `hidden beast` number, since 2 + 0 + 0 + 652 + 5 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17842176 + 2223081 = 4224^2 + 1491^2 .

It is not a de Polignac number, because 20065257 - 2³ = 20065249 is a prime.

It is a super-2 number, since 2×20065257² = 805229076952098, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20065257.

It is not an unprimeable number, because it can be changed into a prime (20065259) 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 in 5 ways as a sum of consecutive naturals, for example, 1114728 + ... + 1114745.

It is an arithmetic number, because the mean of its divisors is an integer number (4830527).

Almost surely, 2^20065257 is an apocalyptic number.

It is an amenable number.

20065257 is a deficient number, since it is larger than the sum of its proper divisors (8917905).

20065257 is a wasteful number, since it uses less digits than its factorization.

20065257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2229479 (or 2229476 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 20065257 is about 4479.4259676883. The cubic root of 20065257 is about 271.7366657331.

The spelling of 20065257 in words is "twenty million, sixty-five thousand, two hundred fifty-seven".