20122109988 has 12 divisors (see below), whose sum is σ = 46951590000. Its totient is φ = 6707369992.

The previous prime is 20122109957. The next prime is 20122109989. The reversal of 20122109988 is 88990122102.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (20122109989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 838421238 + ... + 838421261.

It is an arithmetic number, because the mean of its divisors is an integer number (3912632500).

Almost surely, 2^20122109988 is an apocalyptic number.

It is an amenable number.

20122109988 is an abundant number, since it is smaller than the sum of its proper divisors (26829480012).

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

20122109988 is a wasteful number, since it uses less digits than its factorization.

20122109988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1676842506 (or 1676842504 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 42.

The spelling of 20122109988 in words is "twenty billion, one hundred twenty-two million, one hundred nine thousand, nine hundred eighty-eight".