20908842 has 16 divisors (see below), whose sum is σ = 42189120. Its totient is φ = 6907712.

The previous prime is 20908837. The next prime is 20908883. The reversal of 20908842 is 24880902.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 7 ways as a sum of consecutive naturals, for example, 14742 + ... + 16097.

It is an arithmetic number, because the mean of its divisors is an integer number (2636820).

Almost surely, 2^20908842 is an apocalyptic number.

20908842 is an abundant number, since it is smaller than the sum of its proper divisors (21280278).

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

20908842 is a wasteful number, since it uses less digits than its factorization.

20908842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30957.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 20908842 is about 4572.6187245385. The cubic root of 20908842 is about 275.4926354225.

The spelling of 20908842 in words is "twenty million, nine hundred eight thousand, eight hundred forty-two".