20516304 has 20 divisors (see below), whose sum is σ = 53000576. Its totient is φ = 6838752.

The previous prime is 20516281. The next prime is 20516323. The reversal of 20516304 is 40361502.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213664 + ... + 213759.

Almost surely, 2^20516304 is an apocalyptic number.

20516304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20516304 is an abundant number, since it is smaller than the sum of its proper divisors (32484272).

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

20516304 is a wasteful number, since it uses less digits than its factorization.

20516304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427434 (or 427428 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20516304 is about 4529.4926868249. The cubic root of 20516304 is about 273.7577200133.

Adding to 20516304 its reverse (40361502), we get a palindrome (60877806).

The spelling of 20516304 in words is "twenty million, five hundred sixteen thousand, three hundred four".