20121203304 has 128 divisors (see below), whose sum is σ = 57240000000. Its totient is φ = 6547267584.

The previous prime is 20121203293. The next prime is 20121203309. The reversal of 20121203304 is 40330212102.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20121203309) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1512072 + ... + 1525320.

It is an arithmetic number, because the mean of its divisors is an integer number (447187500).

Almost surely, 2^20121203304 is an apocalyptic number.

20121203304 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 20121203304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28620000000).

20121203304 is an abundant number, since it is smaller than the sum of its proper divisors (37118796696).

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

20121203304 is a wasteful number, since it uses less digits than its factorization.

20121203304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13432 (or 13422 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 20121203304 its reverse (40330212102), we get a palindrome (60451415406).

The spelling of 20121203304 in words is "twenty billion, one hundred twenty-one million, two hundred three thousand, three hundred four".