20897053632 has 336 divisors, whose sum is σ = 77603868160. Its totient is φ = 5220993024.

The previous prime is 20897053631. The next prime is 20897053687. The reversal of 20897053632 is 23635079802.

20897053632 is a `hidden beast` number, since 2 + 0 + 8 + 9 + 7 + 0 + 5 + 3 + 632 = 666.

It is a tau number, because it is divible by the number of its divisors (336).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20897053631) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 985413 + ... + 1006395.

Almost surely, 2^20897053632 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 20897053632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38801934080).

20897053632 is an abundant number, since it is smaller than the sum of its proper divisors (56706814528).

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

20897053632 is a wasteful number, since it uses less digits than its factorization.

20897053632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21040 (or 21027 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 20897053632 in words is "twenty billion, eight hundred ninety-seven million, fifty-three thousand, six hundred thirty-two".