20128502140 has 48 divisors (see below), whose sum is σ = 42706323072. Its totient is φ = 7968669696.

The previous prime is 20128502137. The next prime is 20128502159. The reversal of 20128502140 is 4120582102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 794509 + ... + 819451.

It is an arithmetic number, because the mean of its divisors is an integer number (889715064).

Almost surely, 2^20128502140 is an apocalyptic number.

20128502140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20128502140 is an abundant number, since it is smaller than the sum of its proper divisors (22577820932).

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

20128502140 is a wasteful number, since it uses less digits than its factorization.

20128502140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25366 (or 25364 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The spelling of 20128502140 in words is "twenty billion, one hundred twenty-eight million, five hundred two thousand, one hundred forty".