20812080 has 80 divisors (see below), whose sum is σ = 68325984. Its totient is φ = 5222400.

The previous prime is 20812039. The next prime is 20812091. The reversal of 20812080 is 8021802.

It is a tau number, because it is divible by the number of its divisors (80).

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 15 ways as a sum of consecutive naturals, for example, 1530 + ... + 6630.

Almost surely, 2^20812080 is an apocalyptic number.

20812080 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 20812080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34162992).

20812080 is an abundant number, since it is smaller than the sum of its proper divisors (47513904).

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

20812080 is a wasteful number, since it uses less digits than its factorization.

20812080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5134 (or 5128 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 20812080 is about 4562.0258657750. The cubic root of 20812080 is about 275.0670029573.

Adding to 20812080 its reverse (8021802), we get a palindrome (28833882).

The spelling of 20812080 in words is "twenty million, eight hundred twelve thousand, eighty".