20647758204 has 144 divisors (see below), whose sum is σ = 58429032480. Its totient is φ = 6109655040.

The previous prime is 20647758199. The next prime is 20647758211. The reversal of 20647758204 is 40285774602.

It is a happy number.

20647758204 is a `hidden beast` number, since 2 + 0 + 64 + 7 + 7 + 582 + 0 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 20647758204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2705514 + ... + 2713134.

It is an arithmetic number, because the mean of its divisors is an integer number (405757170).

Almost surely, 2^20647758204 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 20647758204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29214516240).

20647758204 is an abundant number, since it is smaller than the sum of its proper divisors (37781274276).

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

20647758204 is a wasteful number, since it uses less digits than its factorization.

20647758204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7900 (or 7895 counting only the distinct ones).

The product of its (nonzero) digits is 752640, while the sum is 45.

The spelling of 20647758204 in words is "twenty billion, six hundred forty-seven million, seven hundred fifty-eight thousand, two hundred four".