20961264168 has 96 divisors (see below), whose sum is σ = 62437939200. Its totient is φ = 6312380544.

The previous prime is 20961264167. The next prime is 20961264229. The reversal of 20961264168 is 86146216902.

20961264168 is a `hidden beast` number, since 20 + 9 + 612 + 6 + 4 + 1 + 6 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (20961264167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 194248 + ... + 282231.

It is an arithmetic number, because the mean of its divisors is an integer number (650395200).

Almost surely, 2^20961264168 is an apocalyptic number.

It is an amenable number.

20961264168 is an abundant number, since it is smaller than the sum of its proper divisors (41476675032).

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

20961264168 is a wasteful number, since it uses less digits than its factorization.

20961264168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476551 (or 476544 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 20961264168 in words is "twenty billion, nine hundred sixty-one million, two hundred sixty-four thousand, one hundred sixty-eight".