20304261640 has 96 divisors (see below), whose sum is σ = 49572328320. Its totient is φ = 7481320704.

The previous prime is 20304261629. The next prime is 20304261667. The reversal of 20304261640 is 4616240302.

It is a junction number, because it is equal to n+sod(n) for n = 20304261599 and 20304261608.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3532609 + ... + 3538351.

It is an arithmetic number, because the mean of its divisors is an integer number (516378420).

Almost surely, 2^20304261640 is an apocalyptic number.

20304261640 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 20304261640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24786164160).

20304261640 is an abundant number, since it is smaller than the sum of its proper divisors (29268066680).

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

20304261640 is a wasteful number, since it uses less digits than its factorization.

20304261640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6303 (or 6286 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The spelling of 20304261640 in words is "twenty billion, three hundred four million, two hundred sixty-one thousand, six hundred forty".