20468251 has 8 divisors (see below), whose sum is σ = 20848464. Its totient is φ = 20090880.

The previous prime is 20468237. The next prime is 20468281. The reversal of 20468251 is 15286402.

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 20468251 - 2⁵ = 20468219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20468281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18216 + ... + 19306.

It is an arithmetic number, because the mean of its divisors is an integer number (2606058).

Almost surely, 2^20468251 is an apocalyptic number.

20468251 is a deficient number, since it is larger than the sum of its proper divisors (380213).

20468251 is a wasteful number, since it uses less digits than its factorization.

20468251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1421.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 20468251 is about 4524.1851199967. The cubic root of 20468251 is about 273.5438224306.

The spelling of 20468251 in words is "twenty million, four hundred sixty-eight thousand, two hundred fifty-one".