20808550 has 24 divisors (see below), whose sum is σ = 44233776. Its totient is φ = 7134240.

The previous prime is 20808547. The next prime is 20808559. The reversal of 20808550 is 5580802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20808559) 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 11 ways as a sum of consecutive naturals, for example, 29377 + ... + 30076.

It is an arithmetic number, because the mean of its divisors is an integer number (1843074).

Almost surely, 2^20808550 is an apocalyptic number.

20808550 is an abundant number, since it is smaller than the sum of its proper divisors (23425226).

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

20808550 is a wasteful number, since it uses less digits than its factorization.

20808550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59472 (or 59467 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 20808550 is about 4561.6389598477. The cubic root of 20808550 is about 275.0514504285.

The spelling of 20808550 in words is "twenty million, eight hundred eight thousand, five hundred fifty".