20244139 has 8 divisors (see below), whose sum is σ = 21672000. Its totient is φ = 18852552.

The previous prime is 20244121. The next prime is 20244149. The reversal of 20244139 is 93144202.

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 20244139 - 2²³ = 11855531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20244109) 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, 7909 + ... + 10150.

It is an arithmetic number, because the mean of its divisors is an integer number (2709000).

Almost surely, 2^20244139 is an apocalyptic number.

20244139 is a deficient number, since it is larger than the sum of its proper divisors (1427861).

20244139 is a wasteful number, since it uses less digits than its factorization.

20244139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18137.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 20244139 is about 4499.3487306498. The cubic root of 20244139 is about 272.5417897360.

The spelling of 20244139 in words is "twenty million, two hundred forty-four thousand, one hundred thirty-nine".