20884245984 has 96 divisors (see below), whose sum is σ = 69614173440. Its totient is φ = 5966925696.

The previous prime is 20884245947. The next prime is 20884246001. The reversal of 20884245984 is 48954248802.

20884245984 is a `hidden beast` number, since 2 + 0 + 8 + 8 + 42 + 4 + 598 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

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 20884245984.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1720494 + ... + 1732589.

It is an arithmetic number, because the mean of its divisors is an integer number (725147640).

Almost surely, 2^20884245984 is an apocalyptic number.

20884245984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20884245984 is an abundant number, since it is smaller than the sum of its proper divisors (48729927456).

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

20884245984 is a wasteful number, since it uses less digits than its factorization.

20884245984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3453109 (or 3453095 counting only the distinct ones).

The product of its (nonzero) digits is 5898240, while the sum is 54.

The spelling of 20884245984 in words is "twenty billion, eight hundred eighty-four million, two hundred forty-five thousand, nine hundred eighty-four".