20988986988 has 24 divisors (see below), whose sum is σ = 50663072880. Its totient is φ = 6755076160.

The previous prime is 20988986971. The next prime is 20988986989. The reversal of 20988986988 is 88968988902.

It is not an unprimeable number, because it can be changed into a prime (20988986989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30156243 + ... + 30156938.

It is an arithmetic number, because the mean of its divisors is an integer number (2110961370).

Almost surely, 2^20988986988 is an apocalyptic number.

It is an amenable number.

20988986988 is an abundant number, since it is smaller than the sum of its proper divisors (29674085892).

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

20988986988 is a wasteful number, since it uses less digits than its factorization.

20988986988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60313217 (or 60313215 counting only the distinct ones).

The product of its (nonzero) digits is 286654464, while the sum is 75.

The spelling of 20988986988 in words is "twenty billion, nine hundred eighty-eight million, nine hundred eighty-six thousand, nine hundred eighty-eight".