20899726128 has 60 divisors (see below), whose sum is σ = 59734697568. Its totient is φ = 6818348160.

The previous prime is 20899726109. The next prime is 20899726129. The reversal of 20899726128 is 82162799802.

It is not an unprimeable number, because it can be changed into a prime (20899726129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1537243 + ... + 1550778.

Almost surely, 2^20899726128 is an apocalyptic number.

It is an amenable number.

20899726128 is an abundant number, since it is smaller than the sum of its proper divisors (38834971440).

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

20899726128 is a wasteful number, since it uses less digits than its factorization.

20899726128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3088082 (or 3088073 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The spelling of 20899726128 in words is "twenty billion, eight hundred ninety-nine million, seven hundred twenty-six thousand, one hundred twenty-eight".