20908080 has 120 divisors (see below), whose sum is σ = 71379360. Its totient is φ = 5483520.

The previous prime is 20908021. The next prime is 20908099. The reversal of 20908080 is 8080902.

It is a tau number, because it is divible by the number of its divisors (120).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50916 + ... + 51324.

It is an arithmetic number, because the mean of its divisors is an integer number (594828).

Almost surely, 2^20908080 is an apocalyptic number.

20908080 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 20908080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35689680).

20908080 is an abundant number, since it is smaller than the sum of its proper divisors (50471280).

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

20908080 is a wasteful number, since it uses less digits than its factorization.

20908080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499 (or 490 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 20908080 is about 4572.5354017219. The cubic root of 20908080 is about 275.4892887054.

Adding to 20908080 its reverse (8080902), we get a palindrome (28988982).

The spelling of 20908080 in words is "twenty million, nine hundred eight thousand, eighty".