20811571752 has 64 divisors (see below), whose sum is σ = 52914818880. Its totient is φ = 6819697152.

The previous prime is 20811571741. The next prime is 20811571757. The reversal of 20811571752 is 25717511802.

It is a self number, because there is not a number n which added to its sum of digits gives 20811571752.

It is not an unprimeable number, because it can be changed into a prime (20811571757) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 518518 + ... + 557210.

It is an arithmetic number, because the mean of its divisors is an integer number (826794045).

Almost surely, 2^20811571752 is an apocalyptic number.

It is an amenable number.

20811571752 is an abundant number, since it is smaller than the sum of its proper divisors (32103247128).

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

20811571752 is a wasteful number, since it uses less digits than its factorization.

20811571752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39082 (or 39078 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 39.

The spelling of 20811571752 in words is "twenty billion, eight hundred eleven million, five hundred seventy-one thousand, seven hundred fifty-two".