20887756468 has 6 divisors (see below), whose sum is σ = 36553573826. Its totient is φ = 10443878232.

The previous prime is 20887756433. The next prime is 20887756471. The reversal of 20887756468 is 86465778802.

It can be written as a sum of positive squares in only one way, i.e., 12938607504 + 7949148964 = 113748^2 + 89158^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2610969555 + ... + 2610969562.

Almost surely, 2^20887756468 is an apocalyptic number.

It is an amenable number.

20887756468 is a deficient number, since it is larger than the sum of its proper divisors (15665817358).

20887756468 is a wasteful number, since it uses less digits than its factorization.

20887756468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5221939121 (or 5221939119 counting only the distinct ones).

The product of its (nonzero) digits is 36126720, while the sum is 61.

The spelling of 20887756468 in words is "twenty billion, eight hundred eighty-seven million, seven hundred fifty-six thousand, four hundred sixty-eight".