20816120 has 32 divisors (see below), whose sum is σ = 50440320. Its totient is φ = 7685760.

The previous prime is 20816119. The next prime is 20816129. The reversal of 20816120 is 2161802.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20816092 and 20816101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20816129) 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 7 ways as a sum of consecutive naturals, for example, 19496 + ... + 20535.

It is an arithmetic number, because the mean of its divisors is an integer number (1576260).

Almost surely, 2^20816120 is an apocalyptic number.

20816120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20816120 is an abundant number, since it is smaller than the sum of its proper divisors (29624200).

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

20816120 is a wasteful number, since it uses less digits than its factorization.

20816120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40055 (or 40051 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 20816120 is about 4562.4686300291. The cubic root of 20816120 is about 275.0848002942.

Adding to 20816120 its reverse (2161802), we get a palindrome (22977922).

The spelling of 20816120 in words is "twenty million, eight hundred sixteen thousand, one hundred twenty".