20240139 has 4 divisors (see below), whose sum is σ = 26986856. Its totient is φ = 13493424.

The previous prime is 20240107. The next prime is 20240141. The reversal of 20240139 is 93104202.

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

It is not a de Polignac number, because 20240139 - 2⁵ = 20240107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20240159) 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, 3373354 + ... + 3373359.

It is an arithmetic number, because the mean of its divisors is an integer number (6746714).

Almost surely, 2^20240139 is an apocalyptic number.

20240139 is a deficient number, since it is larger than the sum of its proper divisors (6746717).

20240139 is an equidigital number, since it uses as much as digits as its factorization.

20240139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6746716.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 20240139 is about 4498.9041999136. The cubic root of 20240139 is about 272.5238382198.

The spelling of 20240139 in words is "twenty million, two hundred forty thousand, one hundred thirty-nine".