20304056 has 16 divisors (see below), whose sum is σ = 38239800. Its totient is φ = 10106784.

The previous prime is 20304049. The next prime is 20304077. The reversal of 20304056 is 65040302.

It is a super-2 number, since 2×20304056² = 824509380102272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3710 + ... + 7373.

Almost surely, 2^20304056 is an apocalyptic number.

It is an amenable number.

20304056 is a deficient number, since it is larger than the sum of its proper divisors (17935744).

20304056 is a wasteful number, since it uses less digits than its factorization.

20304056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11318 (or 11314 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20304056 is about 4506.0022192627. The cubic root of 20304056 is about 272.8104074368.

Subtracting from 20304056 its sum of digits (20), we obtain a square (20304036 = 4506²).

Adding to 20304056 its reverse (65040302), we get a palindrome (85344358).

The spelling of 20304056 in words is "twenty million, three hundred four thousand, fifty-six".