20897668548 has 192 divisors, whose sum is σ = 58740864000. Its totient is φ = 6484367520.

The previous prime is 20897668543. The next prime is 20897668559. The reversal of 20897668548 is 84586679802.

20897668548 is a `hidden beast` number, since 2 + 0 + 89 + 7 + 6 + 6 + 8 + 548 = 666.

It is not an unprimeable number, because it can be changed into a prime (20897668543) 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, 9805443 + ... + 9807573.

It is an arithmetic number, because the mean of its divisors is an integer number (305942000).

Almost surely, 2^20897668548 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 20897668548, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29370432000).

20897668548 is an abundant number, since it is smaller than the sum of its proper divisors (37843195452).

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

20897668548 is a wasteful number, since it uses less digits than its factorization.

20897668548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2234 (or 2214 counting only the distinct ones).

The product of its (nonzero) digits is 46448640, while the sum is 63.

The spelling of 20897668548 in words is "twenty billion, eight hundred ninety-seven million, six hundred sixty-eight thousand, five hundred forty-eight".