20984033280 has 416 divisors, whose sum is σ = 77677415424. Its totient is φ = 4737466368.

The previous prime is 20984033243. The next prime is 20984033281. The reversal of 20984033280 is 8233048902.

It is a super-2 number, since 2×20984033280² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20984033281) 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, 41717509 + ... + 41718011.

Almost surely, 2^20984033280 is an apocalyptic number.

20984033280 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 20984033280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38838707712).

20984033280 is an abundant number, since it is smaller than the sum of its proper divisors (56693382144).

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

20984033280 is an equidigital number, since it uses as much as digits as its factorization.

20984033280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639 (or 617 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 39.

The spelling of 20984033280 in words is "twenty billion, nine hundred eighty-four million, thirty-three thousand, two hundred eighty".