20528101668 has 36 divisors (see below), whose sum is σ = 49493900400. Its totient is φ = 6621964560.

The previous prime is 20528101661. The next prime is 20528101673. The reversal of 20528101668 is 86610182502.

It is not an unprimeable number, because it can be changed into a prime (20528101661) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 878518 + ... + 901581.

Almost surely, 2^20528101668 is an apocalyptic number.

It is an amenable number.

20528101668 is an abundant number, since it is smaller than the sum of its proper divisors (28965798732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20528101668 is a wasteful number, since it uses less digits than its factorization.

20528101668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1780168 (or 1780135 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The spelling of 20528101668 in words is "twenty billion, five hundred twenty-eight million, one hundred one thousand, six hundred sixty-eight".