20616080 has 40 divisors (see below), whose sum is σ = 48961152. Its totient is φ = 8069504.

The previous prime is 20616041. The next prime is 20616091. The reversal of 20616080 is 8061602.

It is a tau number, because it is divible by the number of its divisors (40).

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 7 ways as a sum of consecutive naturals, for example, 1019 + ... + 6501.

Almost surely, 2^20616080 is an apocalyptic number.

20616080 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 20616080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24480576).

20616080 is an abundant number, since it is smaller than the sum of its proper divisors (28345072).

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

20616080 is a wasteful number, since it uses less digits than its factorization.

20616080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5543 (or 5537 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 20616080 is about 4540.4933652633. The cubic root of 20616080 is about 274.2007869920.

Adding to 20616080 its reverse (8061602), we get a palindrome (28677682).

The spelling of 20616080 in words is "twenty million, six hundred sixteen thousand, eighty".