20415500000 has 336 divisors, whose sum is σ = 60636723840. Its totient is φ = 6609600000.

The previous prime is 20415499987. The next prime is 20415500003. The reversal of 20415500000 is 551402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20415500003) 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 55 ways as a sum of consecutive naturals, for example, 66499847 + ... + 66500153.

It is an arithmetic number, because the mean of its divisors is an integer number (180466440).

Almost surely, 2^20415500000 is an apocalyptic number.

20415500000 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 20415500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30318361920).

20415500000 is an abundant number, since it is smaller than the sum of its proper divisors (40221223840).

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

20415500000 is an frugal number, since it uses more digits than its factorization.

20415500000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 17.

The spelling of 20415500000 in words is "twenty billion, four hundred fifteen million, five hundred thousand".