20939406 has 32 divisors (see below), whose sum is σ = 44634240. Its totient is φ = 6529824.

The previous prime is 20939389. The next prime is 20939419. The reversal of 20939406 is 60493902.

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 15 ways as a sum of consecutive naturals, for example, 8356 + ... + 10568.

It is an arithmetic number, because the mean of its divisors is an integer number (1394820).

Almost surely, 2^20939406 is an apocalyptic number.

20939406 is an abundant number, since it is smaller than the sum of its proper divisors (23694834).

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

20939406 is a wasteful number, since it uses less digits than its factorization.

20939406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2320.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 20939406 is about 4575.9595714997. The cubic root of 20939406 is about 275.6268060515.

The spelling of 20939406 in words is "twenty million, nine hundred thirty-nine thousand, four hundred six".