20912351128 has 16 divisors (see below), whose sum is σ = 39221091000. Its totient is φ = 10453393536.

The previous prime is 20912351077. The next prime is 20912351129. The reversal of 20912351128 is 82115321902.

It is a junction number, because it is equal to n+sod(n) for n = 20912351093 and 20912351102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20912351129) 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 3 ways as a sum of consecutive naturals, for example, 315633 + ... + 376096.

Almost surely, 2^20912351128 is an apocalyptic number.

It is an amenable number.

20912351128 is a deficient number, since it is larger than the sum of its proper divisors (18308739872).

20912351128 is a wasteful number, since it uses less digits than its factorization.

20912351128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695514 (or 695510 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The spelling of 20912351128 in words is "twenty billion, nine hundred twelve million, three hundred fifty-one thousand, one hundred twenty-eight".