20478717600 has 432 divisors, whose sum is σ = 74126130624. Its totient is φ = 4906598400.

The previous prime is 20478717577. The next prime is 20478717607. The reversal of 20478717600 is 671787402.

It is not an unprimeable number, because it can be changed into a prime (20478717607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 28168437 + ... + 28169163.

Almost surely, 2^20478717600 is an apocalyptic number.

20478717600 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 20478717600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37063065312).

20478717600 is an abundant number, since it is smaller than the sum of its proper divisors (53647413024).

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

20478717600 is a wasteful number, since it uses less digits than its factorization.

20478717600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869 (or 845 counting only the distinct ones).

The product of its (nonzero) digits is 131712, while the sum is 42.

The spelling of 20478717600 in words is "twenty billion, four hundred seventy-eight million, seven hundred seventeen thousand, six hundred".