20843904120 has 256 divisors, whose sum is σ = 69434426880. Its totient is φ = 4972492800.

The previous prime is 20843904097. The next prime is 20843904121. The reversal of 20843904120 is 2140934802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20843904121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19104775 + ... + 19105865.

It is an arithmetic number, because the mean of its divisors is an integer number (271228230).

Almost surely, 2^20843904120 is an apocalyptic number.

20843904120 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 20843904120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34717213440).

20843904120 is an abundant number, since it is smaller than the sum of its proper divisors (48590522760).

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

20843904120 is a wasteful number, since it uses less digits than its factorization.

20843904120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1486 (or 1482 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The spelling of 20843904120 in words is "twenty billion, eight hundred forty-three million, nine hundred four thousand, one hundred twenty".