20830304 has 72 divisors (see below), whose sum is σ = 48185928. Its totient is φ = 8760320.

The previous prime is 20830301. The next prime is 20830309. The reversal of 20830304 is 40303802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20830301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 353027 + ... + 353085.

It is an arithmetic number, because the mean of its divisors is an integer number (669249).

Almost surely, 2^20830304 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20830304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24092964).

20830304 is an abundant number, since it is smaller than the sum of its proper divisors (27355624).

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

20830304 is a wasteful number, since it uses less digits than its factorization.

20830304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 20830304 is about 4564.0227869720. The cubic root of 20830304 is about 275.1472665770.

The spelling of 20830304 in words is "twenty million, eight hundred thirty thousand, three hundred four".