20065251 has 8 divisors (see below), whose sum is σ = 27207360. Its totient is φ = 13149992.

The previous prime is 20065249. The next prime is 20065259. The reversal of 20065251 is 15256002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20065251 - 2¹ = 20065249 is a prime.

It is a super-2 number, since 2×20065251² = 805228595386002, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 56505 + ... + 56858.

It is an arithmetic number, because the mean of its divisors is an integer number (3400920).

Almost surely, 2^20065251 is an apocalyptic number.

20065251 is a deficient number, since it is larger than the sum of its proper divisors (7142109).

20065251 is a wasteful number, since it uses less digits than its factorization.

20065251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113425.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 20065251 is about 4479.4252979595. The cubic root of 20065251 is about 271.7366386478.

Subtracting from 20065251 its reverse (15256002), we obtain a square (4809249 = 2193²).

The spelling of 20065251 in words is "twenty million, sixty-five thousand, two hundred fifty-one".