20998918080 has 336 divisors, whose sum is σ = 83371114944. Its totient is φ = 4751769600.

The previous prime is 20998918063. The next prime is 20998918141. The reversal of 20998918080 is 8081989902.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (336).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2031004 + ... + 2041316.

Almost surely, 2^20998918080 is an apocalyptic number.

20998918080 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 20998918080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41685557472).

20998918080 is an abundant number, since it is smaller than the sum of its proper divisors (62372196864).

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

20998918080 is a wasteful number, since it uses less digits than its factorization.

20998918080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10444 (or 10431 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 54.

The spelling of 20998918080 in words is "twenty billion, nine hundred ninety-eight million, nine hundred eighteen thousand, eighty".