20287241872 has 10 divisors (see below), whose sum is σ = 39306531158. Its totient is φ = 10143620928.

The previous prime is 20287241761. The next prime is 20287241893. The reversal of 20287241872 is 27814278202.

It can be written as a sum of positive squares in only one way, i.e., 17217638656 + 3069603216 = 131216^2 + 55404^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633976293 + ... + 633976324.

Almost surely, 2^20287241872 is an apocalyptic number.

It is an amenable number.

20287241872 is a deficient number, since it is larger than the sum of its proper divisors (19019289286).

20287241872 is a wasteful number, since it uses less digits than its factorization.

20287241872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267952625 (or 1267952619 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 43.

The spelling of 20287241872 in words is "twenty billion, two hundred eighty-seven million, two hundred forty-one thousand, eight hundred seventy-two".