20144851 has 4 divisors (see below), whose sum is σ = 20157912. Its totient is φ = 20131792.

The previous prime is 20144837. The next prime is 20144857. The reversal of 20144851 is 15844102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20144851 - 2⁵ = 20144819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20144857) 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 3 ways as a sum of consecutive naturals, for example, 3850 + ... + 7423.

It is an arithmetic number, because the mean of its divisors is an integer number (5039478).

Almost surely, 2^20144851 is an apocalyptic number.

20144851 is a deficient number, since it is larger than the sum of its proper divisors (13061).

20144851 is a wasteful number, since it uses less digits than its factorization.

20144851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13060.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 20144851 is about 4488.3015718644. The cubic root of 20144851 is about 272.0954961325.

Adding to 20144851 its reverse (15844102), we get a palindrome (35988953).

The spelling of 20144851 in words is "twenty million, one hundred forty-four thousand, eight hundred fifty-one".