20808208080 has 360 divisors, whose sum is σ = 80990735904. Its totient is φ = 4747161600.

The previous prime is 20808208061. The next prime is 20808208159. The reversal of 20808208080 is 8080280802.

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 2284335 + ... + 2293425.

Almost surely, 2^20808208080 is an apocalyptic number.

20808208080 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 20808208080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40495367952).

20808208080 is an abundant number, since it is smaller than the sum of its proper divisors (60182527824).

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

20808208080 is a wasteful number, since it uses less digits than its factorization.

20808208080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9155 (or 9129 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 36.

Adding to 20808208080 its reverse (8080280802), we get a palindrome (28888488882).

The spelling of 20808208080 in words is "twenty billion, eight hundred eight million, two hundred eight thousand, eighty".