20042135 has 4 divisors (see below), whose sum is σ = 24050568. Its totient is φ = 16033704.

The previous prime is 20042117. The next prime is 20042173. The reversal of 20042135 is 53124002.

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 20042135 - 2²² = 15847831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 2004209 + ... + 2004218.

It is an arithmetic number, because the mean of its divisors is an integer number (6012642).

Almost surely, 2^20042135 is an apocalyptic number.

20042135 is a deficient number, since it is larger than the sum of its proper divisors (4008433).

20042135 is an equidigital number, since it uses as much as digits as its factorization.

20042135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4008432.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 20042135 is about 4476.8443126828. The cubic root of 20042135 is about 271.6322479302.

Adding to 20042135 its reverse (53124002), we get a palindrome (73166137).

The spelling of 20042135 in words is "twenty million, forty-two thousand, one hundred thirty-five".