20704608 has 144 divisors (see below), whose sum is σ = 63488880. Its totient is φ = 6386688.

The previous prime is 20704603. The next prime is 20704627. The reversal of 20704608 is 80640702.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20704601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 308991 + ... + 309057.

It is an arithmetic number, because the mean of its divisors is an integer number (440895).

Almost surely, 2^20704608 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 20704608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31744440).

20704608 is an abundant number, since it is smaller than the sum of its proper divisors (42784272).

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

20704608 is a wasteful number, since it uses less digits than its factorization.

20704608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 138 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20704608 is about 4550.2316424551. The cubic root of 20704608 is about 274.5927105794.

It can be divided in two parts, 20704 and 608, that added together give a palindrome (21312).

The spelling of 20704608 in words is "twenty million, seven hundred four thousand, six hundred eight".