20708864 has 40 divisors (see below), whose sum is σ = 45151128. Its totient is φ = 9410560.

The previous prime is 20708851. The next prime is 20708867. The reversal of 20708864 is 46880702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20708867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3794 + ... + 7470.

Almost surely, 2^20708864 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 20708864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22575564).

20708864 is an abundant number, since it is smaller than the sum of its proper divisors (24442264).

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

20708864 is an equidigital number, since it uses as much as digits as its factorization.

20708864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3706 (or 3690 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 20708864 is about 4550.6992869228. The cubic root of 20708864 is about 274.6115242095.

The spelling of 20708864 in words is "twenty million, seven hundred eight thousand, eight hundred sixty-four".