20893897728 has 704 divisors, whose sum is σ = 73574092800. Its totient is φ = 5790597120.

The previous prime is 20893897727. The next prime is 20893897733. The reversal of 20893897728 is 82779839802.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (704).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20893897723) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 202853325 + ... + 202853427.

Almost surely, 2^20893897728 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 20893897728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36787046400).

20893897728 is an abundant number, since it is smaller than the sum of its proper divisors (52680195072).

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

20893897728 is a wasteful number, since it uses less digits than its factorization.

20893897728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195 (or 171 counting only the distinct ones).

The product of its (nonzero) digits is 24385536, while the sum is 63.

The spelling of 20893897728 in words is "twenty billion, eight hundred ninety-three million, eight hundred ninety-seven thousand, seven hundred twenty-eight".