20982884780 has 192 divisors, whose sum is σ = 55141793280. Its totient is φ = 6589132800.

The previous prime is 20982884753. The next prime is 20982884801. The reversal of 20982884780 is 8748828902.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8701775 + ... + 8704185.

It is an arithmetic number, because the mean of its divisors is an integer number (287196840).

Almost surely, 2^20982884780 is an apocalyptic number.

20982884780 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 20982884780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27570896640).

20982884780 is an abundant number, since it is smaller than the sum of its proper divisors (34158908500).

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

20982884780 is a wasteful number, since it uses less digits than its factorization.

20982884780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640 (or 2638 counting only the distinct ones).

The product of its (nonzero) digits is 4128768, while the sum is 56.

The spelling of 20982884780 in words is "twenty billion, nine hundred eighty-two million, eight hundred eighty-four thousand, seven hundred eighty".