20704164 has 96 divisors (see below), whose sum is σ = 56843136. Its totient is φ = 5806080.

The previous prime is 20704141. The next prime is 20704171. The reversal of 20704164 is 46140702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98019 + ... + 98229.

It is an arithmetic number, because the mean of its divisors is an integer number (592116).

Almost surely, 2^20704164 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 20704164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28421568).

20704164 is an abundant number, since it is smaller than the sum of its proper divisors (36138972).

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

20704164 is a wasteful number, since it uses less digits than its factorization.

20704164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285 (or 283 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 20704164 is about 4550.1828534686. The cubic root of 20704164 is about 274.5907477308.

Adding to 20704164 its reverse (46140702), we get a palindrome (66844866).

The spelling of 20704164 in words is "twenty million, seven hundred four thousand, one hundred sixty-four".