20011099980 has 96 divisors (see below), whose sum is σ = 58192585920. Its totient is φ = 5133680640.

The previous prime is 20011099963. The next prime is 20011099981. The reversal of 20011099980 is 8999011002.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20011099981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146940 + ... + 248220.

It is an arithmetic number, because the mean of its divisors is an integer number (606172770).

Almost surely, 2^20011099980 is an apocalyptic number.

20011099980 is a gapful number since it is divisible by the number (20) 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 20011099980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29096292960).

20011099980 is an abundant number, since it is smaller than the sum of its proper divisors (38181485940).

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

20011099980 is a wasteful number, since it uses less digits than its factorization.

20011099980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101419 (or 101417 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 39.

The spelling of 20011099980 in words is "twenty billion, eleven million, ninety-nine thousand, nine hundred eighty".