20523595668 has 96 divisors (see below), whose sum is σ = 49163186688. Its totient is φ = 6661785600.

The previous prime is 20523595657. The next prime is 20523595669. The reversal of 20523595668 is 86659532502.

It is a self number, because there is not a number n which added to its sum of digits gives 20523595668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20523595669) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55922421 + ... + 55922787.

It is an arithmetic number, because the mean of its divisors is an integer number (512116528).

Almost surely, 2^20523595668 is an apocalyptic number.

It is an amenable number.

20523595668 is an abundant number, since it is smaller than the sum of its proper divisors (28639591020).

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

20523595668 is a wasteful number, since it uses less digits than its factorization.

20523595668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993 (or 991 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 51.

The spelling of 20523595668 in words is "twenty billion, five hundred twenty-three million, five hundred ninety-five thousand, six hundred sixty-eight".