20647049472 has 288 divisors, whose sum is σ = 70022534400. Its totient is φ = 5878628352.

The previous prime is 20647049471. The next prime is 20647049513. The reversal of 20647049472 is 27494074602.

20647049472 is a `hidden beast` number, since 20 + 6 + 4 + 70 + 494 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is not an unprimeable number, because it can be changed into a prime (20647049471) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18820828 + ... + 18821924.

It is an arithmetic number, because the mean of its divisors is an integer number (243133800).

Almost surely, 2^20647049472 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 20647049472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35011267200).

20647049472 is an abundant number, since it is smaller than the sum of its proper divisors (49375484928).

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

20647049472 is a wasteful number, since it uses less digits than its factorization.

20647049472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1518 (or 1498 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 45.

The spelling of 20647049472 in words is "twenty billion, six hundred forty-seven million, forty-nine thousand, four hundred seventy-two".