20304160 has 48 divisors (see below), whose sum is σ = 50500800. Its totient is φ = 7693056.

The previous prime is 20304139. The next prime is 20304161. The reversal of 20304160 is 6140302.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (20304161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 300 + ... + 6379.

It is an arithmetic number, because the mean of its divisors is an integer number (1052100).

Almost surely, 2^20304160 is an apocalyptic number.

20304160 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 20304160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25250400).

20304160 is an abundant number, since it is smaller than the sum of its proper divisors (30196640).

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

20304160 is a wasteful number, since it uses less digits than its factorization.

20304160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6713 (or 6705 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20304160 is about 4506.0137594109. The cubic root of 20304160 is about 272.8108732261.

Adding to 20304160 its reverse (6140302), we get a palindrome (26444462).

The spelling of 20304160 in words is "twenty million, three hundred four thousand, one hundred sixty".