20305180 has 24 divisors (see below), whose sum is σ = 48732768. Its totient is φ = 6961728.

The previous prime is 20305171. The next prime is 20305189. The reversal of 20305180 is 8150302.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20305171) and next prime (20305189).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20305189) 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, 72379 + ... + 72658.

It is an arithmetic number, because the mean of its divisors is an integer number (2030532).

Almost surely, 2^20305180 is an apocalyptic number.

20305180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20305180 is an abundant number, since it is smaller than the sum of its proper divisors (28427588).

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

20305180 is a wasteful number, since it uses less digits than its factorization.

20305180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145053 (or 145051 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 20305180 is about 4506.1269400673. The cubic root of 20305180 is about 272.8154414596.

Adding to 20305180 its reverse (8150302), we get a palindrome (28455482).

The spelling of 20305180 in words is "twenty million, three hundred five thousand, one hundred eighty".