20090808 has 64 divisors (see below), whose sum is σ = 57024000. Its totient is φ = 6551136.

The previous prime is 20090801. The next prime is 20090813. The reversal of 20090808 is 80809002.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20090801) 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 15 ways as a sum of consecutive naturals, for example, 9163 + ... + 11141.

It is an arithmetic number, because the mean of its divisors is an integer number (891000).

Almost surely, 2^20090808 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 20090808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28512000).

20090808 is an abundant number, since it is smaller than the sum of its proper divisors (36933192).

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

20090808 is a wasteful number, since it uses less digits than its factorization.

20090808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2041 (or 2031 counting only the distinct ones).

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

The square root of 20090808 is about 4482.2770998679. The cubic root of 20090808 is about 271.8519595219.

The spelling of 20090808 in words is "twenty million, ninety thousand, eight hundred eight".