20708320 has 48 divisors (see below), whose sum is σ = 50621760. Its totient is φ = 7995904.

The previous prime is 20708297. The next prime is 20708323. The reversal of 20708320 is 2380702.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20708291 and 20708300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20708323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2409 + ... + 6871.

It is an arithmetic number, because the mean of its divisors is an integer number (1054620).

Almost surely, 2^20708320 is an apocalyptic number.

20708320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20708320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25310880).

20708320 is an abundant number, since it is smaller than the sum of its proper divisors (29913440).

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

20708320 is a wasteful number, since it uses less digits than its factorization.

20708320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4507 (or 4499 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 20708320 is about 4550.6395154967. The cubic root of 20708320 is about 274.6091196035.

The spelling of 20708320 in words is "twenty million, seven hundred eight thousand, three hundred twenty".