20471657472 has 792 divisors, whose sum is σ = 75428773056. Its totient is φ = 5518098432.

The previous prime is 20471657389. The next prime is 20471657473. The reversal of 20471657472 is 27475617402.

20471657472 is a `hidden beast` number, since 2 + 0 + 4 + 7 + 1 + 6 + 574 + 72 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20471657473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 280433628 + ... + 280433700.

Almost surely, 2^20471657472 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 20471657472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37714386528).

20471657472 is an abundant number, since it is smaller than the sum of its proper divisors (54957115584).

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

20471657472 is an equidigital number, since it uses as much as digits as its factorization.

20471657472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145 (or 108 counting only the distinct ones).

The product of its (nonzero) digits is 658560, while the sum is 45.

The spelling of 20471657472 in words is "twenty billion, four hundred seventy-one million, six hundred fifty-seven thousand, four hundred seventy-two".