20276656128 has 120 divisors (see below), whose sum is σ = 60565344840. Its totient is φ = 6758830080.

The previous prime is 20276656123. The next prime is 20276656159. The reversal of 20276656128 is 82165667202.

20276656128 is a `hidden beast` number, since 2 + 0 + 2 + 7 + 66 + 561 + 28 = 666.

It is a super-2 number, since 2×20276656128² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20276656123) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 104773 + ... + 227003.

It is an arithmetic number, because the mean of its divisors is an integer number (504711207).

Almost surely, 2^20276656128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20276656128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30282672420).

20276656128 is an abundant number, since it is smaller than the sum of its proper divisors (40288688712).

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

20276656128 is an equidigital number, since it uses as much as digits as its factorization.

20276656128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122265 (or 122236 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 20276656128 in words is "twenty billion, two hundred seventy-six million, six hundred fifty-six thousand, one hundred twenty-eight".