20639304 has 96 divisors (see below), whose sum is σ = 65994240. Its totient is φ = 5702400.

The previous prime is 20639291. The next prime is 20639327. The reversal of 20639304 is 40393602.

20639304 is a `hidden beast` number, since 20 + 639 + 3 + 0 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 14964 + ... + 16284.

It is an arithmetic number, because the mean of its divisors is an integer number (687440).

Almost surely, 2^20639304 is an apocalyptic number.

20639304 is a gapful number since it is divisible by the number (24) 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 20639304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32997120).

20639304 is an abundant number, since it is smaller than the sum of its proper divisors (45354936).

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

20639304 is a wasteful number, since it uses less digits than its factorization.

20639304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1371 (or 1364 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 20639304 is about 4543.0500767656. The cubic root of 20639304 is about 274.3037106868.

The spelling of 20639304 in words is "twenty million, six hundred thirty-nine thousand, three hundred four".