20808704 has 44 divisors (see below), whose sum is σ = 47555904. Its totient is φ = 8914944.

The previous prime is 20808703. The next prime is 20808713. The reversal of 20808704 is 40780802.

It is not an unprimeable number, because it can be changed into a prime (20808703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5717 + ... + 8619.

It is an arithmetic number, because the mean of its divisors is an integer number (1080816).

Almost surely, 2^20808704 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20808704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23777952).

20808704 is an abundant number, since it is smaller than the sum of its proper divisors (26747200).

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

20808704 is an equidigital number, since it uses as much as digits as its factorization.

20808704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2930 (or 2912 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 20808704 is about 4561.6558397143. The cubic root of 20808704 is about 275.0521289608.

It can be divided in two parts, 20808 and 704, that added together give a palindrome (21512).

The spelling of 20808704 in words is "twenty million, eight hundred eight thousand, seven hundred four".