20318955984 has 120 divisors (see below), whose sum is σ = 60987569760. Its totient is φ = 6295401216.

The previous prime is 20318955977. The next prime is 20318956027. The reversal of 20318955984 is 48955981302.

20318955984 is a `hidden beast` number, since 2 + 0 + 3 + 1 + 8 + 9 + 559 + 84 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 20318955984.

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 23 ways as a sum of consecutive naturals, for example, 74947 + ... + 215069.

It is an arithmetic number, because the mean of its divisors is an integer number (508229748).

Almost surely, 2^20318955984 is an apocalyptic number.

20318955984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20318955984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30493784880).

20318955984 is an abundant number, since it is smaller than the sum of its proper divisors (40668613776).

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

20318955984 is a wasteful number, since it uses less digits than its factorization.

20318955984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140209 (or 140200 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 54.

The spelling of 20318955984 in words is "twenty billion, three hundred eighteen million, nine hundred fifty-five thousand, nine hundred eighty-four".