20036636928 has 864 divisors, whose sum is σ = 77139578880. Its totient is φ = 5036359680.

The previous prime is 20036636927. The next prime is 20036636929. The reversal of 20036636928 is 82963663002.

20036636928 is a `hidden beast` number, since 2 + 0 + 0 + 3 + 6 + 636 + 9 + 2 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (20036636927) and next prime (20036636929).

It is a tau number, because it is divible by the number of its divisors (864).

It is not an unprimeable number, because it can be changed into a prime (20036636927) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 225130708 + ... + 225130796.

It is an arithmetic number, because the mean of its divisors is an integer number (89281920).

Almost surely, 2^20036636928 is an apocalyptic number.

20036636928 is a gapful number since it is divisible by the number (28) 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 20036636928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38569789440).

20036636928 is an abundant number, since it is smaller than the sum of its proper divisors (57102941952).

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

20036636928 is an equidigital number, since it uses as much as digits as its factorization.

20036636928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185 (or 159 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 45.

The spelling of 20036636928 in words is "twenty billion, thirty-six million, six hundred thirty-six thousand, nine hundred twenty-eight".