20144138 has 8 divisors (see below), whose sum is σ = 34532832. Its totient is φ = 8633196.

The previous prime is 20144129. The next prime is 20144143. The reversal of 20144138 is 83144102.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 719420 + ... + 719447.

It is an arithmetic number, because the mean of its divisors is an integer number (4316604).

Almost surely, 2^20144138 is an apocalyptic number.

20144138 is a deficient number, since it is larger than the sum of its proper divisors (14388694).

20144138 is a wasteful number, since it uses less digits than its factorization.

20144138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438876.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 20144138 is about 4488.2221424524. Note that the first 3 decimals coincide. The cubic root of 20144138 is about 272.0922859429.

The spelling of 20144138 in words is "twenty million, one hundred forty-four thousand, one hundred thirty-eight".