20839142 has 16 divisors (see below), whose sum is σ = 32320512. Its totient is φ = 10071240.

The previous prime is 20839141. The next prime is 20839157. The reversal of 20839142 is 24193802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20839141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6467 + ... + 9137.

It is an arithmetic number, because the mean of its divisors is an integer number (2020032).

Almost surely, 2^20839142 is an apocalyptic number.

20839142 is a deficient number, since it is larger than the sum of its proper divisors (11481370).

20839142 is a wasteful number, since it uses less digits than its factorization.

20839142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2803.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 20839142 is about 4564.9909090819. The cubic root of 20839142 is about 275.1861747579.

The spelling of 20839142 in words is "twenty million, eight hundred thirty-nine thousand, one hundred forty-two".