20100021984 has 72 divisors (see below), whose sum is σ = 65325078000. Its totient is φ = 5742862848.

The previous prime is 20100021983. The next prime is 20100022009. The reversal of 20100021984 is 48912000102.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100021983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4983109 + ... + 4987140.

It is an arithmetic number, because the mean of its divisors is an integer number (907292750).

Almost surely, 2^20100021984 is an apocalyptic number.

20100021984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20100021984 is an abundant number, since it is smaller than the sum of its proper divisors (45225056016).

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

20100021984 is a wasteful number, since it uses less digits than its factorization.

20100021984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9970272 (or 9970261 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The spelling of 20100021984 in words is "twenty billion, one hundred million, twenty-one thousand, nine hundred eighty-four".