20208563128 has 16 divisors (see below), whose sum is σ = 40805752680. Its totient is φ = 9327029088.

The previous prime is 20208563107. The next prime is 20208563129. The reversal of 20208563128 is 82136580202.

It is a super-2 number, since 2×20208563128² (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 (20208563129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97156450 + ... + 97156657.

Almost surely, 2^20208563128 is an apocalyptic number.

It is an amenable number.

20208563128 is an abundant number, since it is smaller than the sum of its proper divisors (20597189552).

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

20208563128 is a wasteful number, since it uses less digits than its factorization.

20208563128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194313126 (or 194313122 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The spelling of 20208563128 in words is "twenty billion, two hundred eight million, five hundred sixty-three thousand, one hundred twenty-eight".