20144021 has 8 divisors (see below), whose sum is σ = 21588864. Its totient is φ = 18746640.

The previous prime is 20143999. The next prime is 20144023. The reversal of 20144021 is 12044102.

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 20144021 - 2¹⁴ = 20127637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20143987 and 20144005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20144023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10985 + ... + 12686.

It is an arithmetic number, because the mean of its divisors is an integer number (2698608).

Almost surely, 2^20144021 is an apocalyptic number.

It is an amenable number.

20144021 is a deficient number, since it is larger than the sum of its proper divisors (1444843).

20144021 is a wasteful number, since it uses less digits than its factorization.

20144021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23731.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 20144021 is about 4488.2091083193. The cubic root of 20144021 is about 272.0917591584.

Adding to 20144021 its reverse (12044102), we get a palindrome (32188123).

The spelling of 20144021 in words is "twenty million, one hundred forty-four thousand, twenty-one".