20305080 has 96 divisors (see below), whose sum is σ = 68468400. Its totient is φ = 5412096.

The previous prime is 20305079. The next prime is 20305097. The reversal of 20305080 is 8050302.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 8676 + ... + 10764.

Almost surely, 2^20305080 is an apocalyptic number.

20305080 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 20305080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34234200).

20305080 is an abundant number, since it is smaller than the sum of its proper divisors (48163320).

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

20305080 is a wasteful number, since it uses less digits than its factorization.

20305080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2115 (or 2099 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20305080 is about 4506.1158440502. The cubic root of 20305080 is about 272.8149936003.

Adding to 20305080 its reverse (8050302), we get a palindrome (28355382).

The spelling of 20305080 in words is "twenty million, three hundred five thousand, eighty".