20042039 has 4 divisors (see below), whose sum is σ = 20913456. Its totient is φ = 19170624.

The previous prime is 20041981. The next prime is 20042041. The reversal of 20042039 is 93024002.

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

It is a cyclic number.

It is not a de Polignac number, because 20042039 - 2⁸ = 20041783 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20042039.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20042059) 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, 435674 + ... + 435719.

It is an arithmetic number, because the mean of its divisors is an integer number (5228364).

Almost surely, 2^20042039 is an apocalyptic number.

20042039 is a deficient number, since it is larger than the sum of its proper divisors (871417).

20042039 is an equidigital number, since it uses as much as digits as its factorization.

20042039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871416.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 20042039 is about 4476.8335908318. The cubic root of 20042039 is about 271.6318142316.

The spelling of 20042039 in words is "twenty million, forty-two thousand, thirty-nine".