20727281280 has 256 divisors, whose sum is σ = 70921008000. Its totient is φ = 5130289152.

The previous prime is 20727281261. The next prime is 20727281291. The reversal of 20727281280 is 8218272702.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2378371 + ... + 2387069.

Almost surely, 2^20727281280 is an apocalyptic number.

20727281280 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 20727281280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35460504000).

20727281280 is an abundant number, since it is smaller than the sum of its proper divisors (50193726720).

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

20727281280 is a wasteful number, since it uses less digits than its factorization.

20727281280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8811 (or 8799 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 39.

The spelling of 20727281280 in words is "twenty billion, seven hundred twenty-seven million, two hundred eighty-one thousand, two hundred eighty".