20304600 has 96 divisors (see below), whose sum is σ = 64489920. Its totient is φ = 5281920.

The previous prime is 20304589. The next prime is 20304617. The reversal of 20304600 is 640302.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20304600.

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, 25407 + ... + 26193.

It is an arithmetic number, because the mean of its divisors is an integer number (671770).

Almost surely, 2^20304600 is an apocalyptic number.

20304600 is a gapful number since it is divisible by the number (20) 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 20304600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32244960).

20304600 is an abundant number, since it is smaller than the sum of its proper divisors (44185320).

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

20304600 is a wasteful number, since it uses less digits than its factorization.

20304600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849 (or 840 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 20304600 is about 4506.0625827878. The cubic root of 20304600 is about 272.8128438554.

Adding to 20304600 its reverse (640302), we get a palindrome (20944902).

The spelling of 20304600 in words is "twenty million, three hundred four thousand, six hundred".