20239806 has 16 divisors (see below), whose sum is σ = 40524048. Its totient is φ = 6739200.

The previous prime is 20239787. The next prime is 20239811. The reversal of 20239806 is 60893202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8686 + ... + 10766.

It is an arithmetic number, because the mean of its divisors is an integer number (2532753).

Almost surely, 2^20239806 is an apocalyptic number.

20239806 is an abundant number, since it is smaller than the sum of its proper divisors (20284242).

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

20239806 is a wasteful number, since it uses less digits than its factorization.

20239806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3707.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 20239806 is about 4498.8671907492. The cubic root of 20239806 is about 272.5223436495.

The spelling of 20239806 in words is "twenty million, two hundred thirty-nine thousand, eight hundred six".