20987857148 has 12 divisors (see below), whose sum is σ = 37995258840. Its totient is φ = 10132068912.

The previous prime is 20987857147. The next prime is 20987857153. The reversal of 20987857148 is 84175878902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20987857147) 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, 90464786 + ... + 90465017.

It is an arithmetic number, because the mean of its divisors is an integer number (3166271570).

Almost surely, 2^20987857148 is an apocalyptic number.

It is an amenable number.

20987857148 is a deficient number, since it is larger than the sum of its proper divisors (17007401692).

20987857148 is a wasteful number, since it uses less digits than its factorization.

20987857148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180929836 (or 180929834 counting only the distinct ones).

The product of its (nonzero) digits is 9031680, while the sum is 59.

The spelling of 20987857148 in words is "twenty billion, nine hundred eighty-seven million, eight hundred fifty-seven thousand, one hundred forty-eight".