20531766688 has 48 divisors (see below), whose sum is σ = 41053680360. Its totient is φ = 10106643456.

The previous prime is 20531766641. The next prime is 20531766701. The reversal of 20531766688 is 88666713502.

It can be written as a sum of positive squares in 4 ways, for example, as 15175283344 + 5356483344 = 123188^2 + 73188^2 .

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 7 ways as a sum of consecutive naturals, for example, 528870 + ... + 566362.

Almost surely, 2^20531766688 is an apocalyptic number.

It is an amenable number.

20531766688 is a deficient number, since it is larger than the sum of its proper divisors (20521913672).

20531766688 is a wasteful number, since it uses less digits than its factorization.

20531766688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37769 (or 37761 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 52.

The spelling of 20531766688 in words is "twenty billion, five hundred thirty-one million, seven hundred sixty-six thousand, six hundred eighty-eight".