20345900000 has 72 divisors (see below), whose sum is σ = 50067029880. Its totient is φ = 8138320000.

The previous prime is 20345899991. The next prime is 20345900021. The reversal of 20345900000 is 954302.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1730 + ... + 201729.

It is an arithmetic number, because the mean of its divisors is an integer number (695375415).

Almost surely, 2^20345900000 is an apocalyptic number.

20345900000 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 20345900000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25033514940).

20345900000 is an abundant number, since it is smaller than the sum of its proper divisors (29721129880).

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

20345900000 is an frugal number, since it uses more digits than its factorization.

20345900000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203494 (or 203466 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The spelling of 20345900000 in words is "twenty billion, three hundred forty-five million, nine hundred thousand".