20835808 has 48 divisors (see below), whose sum is σ = 47222784. Its totient is φ = 8864640.

The previous prime is 20835803. The next prime is 20835809. The reversal of 20835808 is 80853802.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20835803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42541 + ... + 43027.

It is an arithmetic number, because the mean of its divisors is an integer number (983808).

Almost surely, 2^20835808 is an apocalyptic number.

20835808 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20835808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23611392).

20835808 is an abundant number, since it is smaller than the sum of its proper divisors (26386976).

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

20835808 is a wasteful number, since it uses less digits than its factorization.

20835808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695 (or 687 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 20835808 is about 4564.6257239778. The cubic root of 20835808 is about 275.1714985356.

The spelling of 20835808 in words is "twenty million, eight hundred thirty-five thousand, eight hundred eight".