20808060 has 192 divisors, whose sum is σ = 74360832. Its totient is φ = 4230144.

The previous prime is 20808019. The next prime is 20808071. The reversal of 20808060 is 6080802.

It is a self number, because there is not a number n which added to its sum of digits gives 20808060.

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 63 ways as a sum of consecutive naturals, for example, 201969 + ... + 202071.

It is an arithmetic number, because the mean of its divisors is an integer number (387296).

Almost surely, 2^20808060 is an apocalyptic number.

20808060 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 20808060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37180416).

20808060 is an abundant number, since it is smaller than the sum of its proper divisors (53552772).

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

20808060 is a wasteful number, since it uses less digits than its factorization.

20808060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 20808060 is about 4561.5852507654. The cubic root of 20808060 is about 275.0492914399.

Adding to 20808060 its reverse (6080802), we get a palindrome (26888862).

The spelling of 20808060 in words is "twenty million, eight hundred eight thousand, sixty".