20904042 has 8 divisors (see below), whose sum is σ = 41808096. Its totient is φ = 6968012.

The previous prime is 20904031. The next prime is 20904043. The reversal of 20904042 is 24040902.

It is a sphenic number, since it is the product of 3 distinct primes.

20904042 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (20904043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1741998 + ... + 1742009.

It is an arithmetic number, because the mean of its divisors is an integer number (5226012).

Almost surely, 2^20904042 is an apocalyptic number.

20904042 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20904042 is a wasteful number, since it uses less digits than its factorization.

20904042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3484012.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 20904042 is about 4572.0938310582. The cubic root of 20904042 is about 275.4715523825.

Adding to 20904042 its reverse (24040902), we get a palindrome (44944944).

The spelling of 20904042 in words is "twenty million, nine hundred four thousand, forty-two".