20006500000 has 84 divisors (see below), whose sum is σ = 49235346342. Its totient is φ = 8002400000.

The previous prime is 20006499979. The next prime is 20006500001. The reversal of 20006500000 is 560002.

It can be written as a sum of positive squares in 7 ways, for example, as 11362707216 + 8643792784 = 106596^2 + 92972^2 .

It is not an unprimeable number, because it can be changed into a prime (20006500001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 479994 + ... + 520006.

Almost surely, 2^20006500000 is an apocalyptic number.

20006500000 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 20006500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24617673171).

20006500000 is an abundant number, since it is smaller than the sum of its proper divisors (29228846342).

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

20006500000 is an frugal number, since it uses more digits than its factorization.

20006500000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40053 (or 40020 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 13.

The spelling of 20006500000 in words is "twenty billion, six million, five hundred thousand".