20655897768 has 96 divisors (see below), whose sum is σ = 61074842400. Its totient is φ = 6254640000.

The previous prime is 20655897763. The next prime is 20655897809. The reversal of 20655897768 is 86779855602.

20655897768 is a `hidden beast` number, since 2 + 0 + 6 + 558 + 9 + 7 + 76 + 8 = 666.

It is a super-2 number, since 2×20655897768² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20655897763) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1122643 + ... + 1140893.

It is an arithmetic number, because the mean of its divisors is an integer number (636196275).

Almost surely, 2^20655897768 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 20655897768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30537421200).

20655897768 is an abundant number, since it is smaller than the sum of its proper divisors (40418944632).

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

20655897768 is a wasteful number, since it uses less digits than its factorization.

20655897768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19703 (or 19696 counting only the distinct ones).

The product of its (nonzero) digits is 50803200, while the sum is 63.

The spelling of 20655897768 in words is "twenty billion, six hundred fifty-five million, eight hundred ninety-seven thousand, seven hundred sixty-eight".