20608321536 has 384 divisors, whose sum is σ = 70549315200. Its totient is φ = 5874647040.

The previous prime is 20608321529. The next prime is 20608321561. The reversal of 20608321536 is 63512380602.

It is a happy number.

20608321536 is a `hidden beast` number, since 2 + 0 + 608 + 3 + 2 + 15 + 36 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a super-2 number, since 2×20608321536² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20608321536.

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, 10339356 + ... + 10341348.

It is an arithmetic number, because the mean of its divisors is an integer number (183722175).

Almost surely, 2^20608321536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20608321536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35274657600).

20608321536 is an abundant number, since it is smaller than the sum of its proper divisors (49940993664).

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

20608321536 is a wasteful number, since it uses less digits than its factorization.

20608321536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052 (or 2026 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 20608321536 in words is "twenty billion, six hundred eight million, three hundred twenty-one thousand, five hundred thirty-six".