20704288 has 48 divisors (see below), whose sum is σ = 44906400. Its totient is φ = 9318400.

The previous prime is 20704279. The next prime is 20704309. The reversal of 20704288 is 88240702.

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, 45888 + ... + 46336.

It is an arithmetic number, because the mean of its divisors is an integer number (935550).

Almost surely, 2^20704288 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 20704288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22453200).

20704288 is an abundant number, since it is smaller than the sum of its proper divisors (24202112).

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

20704288 is a wasteful number, since it uses less digits than its factorization.

20704288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601 (or 593 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 20704288 is about 4550.1964792743. The cubic root of 20704288 is about 274.5912959166.

The spelling of 20704288 in words is "twenty million, seven hundred four thousand, two hundred eighty-eight".