20571135672 has 32 divisors (see below), whose sum is σ = 52623838080. Its totient is φ = 6697578720.

The previous prime is 20571135649. The next prime is 20571135677. The reversal of 20571135672 is 27653117502.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20571135672.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20571135677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9965604 + ... + 9967667.

It is an arithmetic number, because the mean of its divisors is an integer number (1644494940).

Almost surely, 2^20571135672 is an apocalyptic number.

It is an amenable number.

20571135672 is an abundant number, since it is smaller than the sum of its proper divisors (32052702408).

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

20571135672 is a wasteful number, since it uses less digits than its factorization.

20571135672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19933323 (or 19933319 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 39.

The spelling of 20571135672 in words is "twenty billion, five hundred seventy-one million, one hundred thirty-five thousand, six hundred seventy-two".