20800806 has 16 divisors (see below), whose sum is σ = 44801904. Its totient is φ = 6400224.

The previous prime is 20800739. The next prime is 20800807. The reversal of 20800806 is 60800802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20800807) by changing a digit.

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, 133261 + ... + 133416.

It is an arithmetic number, because the mean of its divisors is an integer number (2800119).

Almost surely, 2^20800806 is an apocalyptic number.

20800806 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20800806 is an abundant number, since it is smaller than the sum of its proper divisors (24001098).

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

20800806 is a wasteful number, since it uses less digits than its factorization.

20800806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266695.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 20800806 is about 4560.7900631360. The cubic root of 20800806 is about 275.0173256302.

The spelling of 20800806 in words is "twenty million, eight hundred thousand, eight hundred six".