20305000000 has 224 divisors, whose sum is σ = 52387365888. Its totient is φ = 7800000000.

The previous prime is 20304999991. The next prime is 20305000013. The reversal of 20305000000 is 50302.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154999935 + ... + 155000065.

Almost surely, 2^20305000000 is an apocalyptic number.

20305000000 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 20305000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26193682944).

20305000000 is an abundant number, since it is smaller than the sum of its proper divisors (32082365888).

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

20305000000 is an frugal number, since it uses more digits than its factorization.

20305000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 10.

Adding to 20305000000 its reverse (50302), we get a palindrome (20305050302).

The spelling of 20305000000 in words is "twenty billion, three hundred five million", and thus it is an aban number.