20128113880 has 64 divisors (see below), whose sum is σ = 52606543680. Its totient is φ = 6787929600.

The previous prime is 20128113877. The next prime is 20128113881. The reversal of 20128113880 is 8831182102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20128113881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 572151 + ... + 606310.

It is an arithmetic number, because the mean of its divisors is an integer number (821977245).

Almost surely, 2^20128113880 is an apocalyptic number.

20128113880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20128113880 is an abundant number, since it is smaller than the sum of its proper divisors (32478429800).

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

20128113880 is a wasteful number, since it uses less digits than its factorization.

20128113880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178540 (or 1178536 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 34.

Adding to 20128113880 its reverse (8831182102), we get a palindrome (28959295982).

The spelling of 20128113880 in words is "twenty billion, one hundred twenty-eight million, one hundred thirteen thousand, eight hundred eighty".