20304144 has 60 divisors (see below), whose sum is σ = 64944256. Its totient is φ = 5800896.

The previous prime is 20304139. The next prime is 20304161. The reversal of 20304144 is 44140302.

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9064 + ... + 11079.

Almost surely, 2^20304144 is an apocalyptic number.

20304144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20304144 is an abundant number, since it is smaller than the sum of its proper divisors (44640112).

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

20304144 is a wasteful number, since it uses less digits than its factorization.

20304144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20164 (or 20155 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 20304144 is about 4506.0119840054. The cubic root of 20304144 is about 272.8108015663.

Adding to 20304144 its reverse (44140302), we get a palindrome (64444446).

The spelling of 20304144 in words is "twenty million, three hundred four thousand, one hundred forty-four".