20636080 has 80 divisors (see below), whose sum is σ = 50782464. Its totient is φ = 7787520.

The previous prime is 20636059. The next prime is 20636089. The reversal of 20636080 is 8063602.

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

It is not an unprimeable number, because it can be changed into a prime (20636089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131362 + ... + 131518.

Almost surely, 2^20636080 is an apocalyptic number.

20636080 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 20636080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25391232).

20636080 is an abundant number, since it is smaller than the sum of its proper divisors (30146384).

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

20636080 is a wasteful number, since it uses less digits than its factorization.

20636080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254 (or 248 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 20636080 is about 4542.6952352100. The cubic root of 20636080 is about 274.2894272398.

Adding to 20636080 its reverse (8063602), we get a palindrome (28699682).

The spelling of 20636080 in words is "twenty million, six hundred thirty-six thousand, eighty".