20993802984 has 144 divisors (see below), whose sum is σ = 71425404960. Its totient is φ = 5452920000.

The previous prime is 20993802983. The next prime is 20993803001. The reversal of 20993802984 is 48920839902.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20993802984.

It is not an unprimeable number, because it can be changed into a prime (20993802983) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 111142 + ... + 233109.

Almost surely, 2^20993802984 is an apocalyptic number.

20993802984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20993802984 is an abundant number, since it is smaller than the sum of its proper divisors (50431601976).

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

20993802984 is a wasteful number, since it uses less digits than its factorization.

20993802984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344292 (or 344274 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

It can be divided in two parts, 2099 and 3802984, that added together give a palindrome (3805083).

The spelling of 20993802984 in words is "twenty billion, nine hundred ninety-three million, eight hundred two thousand, nine hundred eighty-four".