20808160 has 24 divisors (see below), whose sum is σ = 49159656. Its totient is φ = 8323200.

The previous prime is 20808107. The next prime is 20808233. The reversal of 20808160 is 6180802.

It is a Smith number, since the sum of its digits (25) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64866 + ... + 65185.

It is an arithmetic number, because the mean of its divisors is an integer number (2048319).

Almost surely, 2^20808160 is an apocalyptic number.

20808160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20808160 is an abundant number, since it is smaller than the sum of its proper divisors (28351496).

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

20808160 is a wasteful number, since it uses less digits than its factorization.

20808160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130066 (or 130058 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 20808160 is about 4561.5962118539. The cubic root of 20808160 is about 275.0497320526.

Adding to 20808160 its reverse (6180802), we get a palindrome (26988962).

The spelling of 20808160 in words is "twenty million, eight hundred eight thousand, one hundred sixty".