20256894720 has 360 divisors, whose sum is σ = 74042869824. Its totient is φ = 5285634048.

The previous prime is 20256894683. The next prime is 20256894773. The reversal of 20256894720 is 2749865202.

20256894720 is a `hidden beast` number, since 20 + 2 + 568 + 9 + 47 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4870882 + ... + 4875038.

Almost surely, 2^20256894720 is an apocalyptic number.

20256894720 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 20256894720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37021434912).

20256894720 is an abundant number, since it is smaller than the sum of its proper divisors (53785975104).

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

20256894720 is an equidigital number, since it uses as much as digits as its factorization.

20256894720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4237 (or 4214 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 20256894720 in words is "twenty billion, two hundred fifty-six million, eight hundred ninety-four thousand, seven hundred twenty".