20965742784 has 112 divisors (see below), whose sum is σ = 70440499200. Its totient is φ = 5990208768.

The previous prime is 20965742741. The next prime is 20965742797. The reversal of 20965742784 is 48724756902.

20965742784 is a `hidden beast` number, since 2 + 0 + 96 + 57 + 427 + 84 = 666.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 20965742784.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 854544 + ... + 878735.

Almost surely, 2^20965742784 is an apocalyptic number.

20965742784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20965742784 is an abundant number, since it is smaller than the sum of its proper divisors (49474756416).

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

20965742784 is a wasteful number, since it uses less digits than its factorization.

20965742784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1733307 (or 1733291 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 54.

The spelling of 20965742784 in words is "twenty billion, nine hundred sixty-five million, seven hundred forty-two thousand, seven hundred eighty-four".