20713057728 has 112 divisors (see below), whose sum is σ = 60167178624. Its totient is φ = 6236605440.

The previous prime is 20713057709. The next prime is 20713057733. The reversal of 20713057728 is 82775031702.

It is a self number, because there is not a number n which added to its sum of digits gives 20713057728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 300351 + ... + 362817.

It is an arithmetic number, because the mean of its divisors is an integer number (537206952).

Almost surely, 2^20713057728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20713057728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30083589312).

20713057728 is an abundant number, since it is smaller than the sum of its proper divisors (39454120896).

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

20713057728 is a wasteful number, since it uses less digits than its factorization.

20713057728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62650 (or 62640 counting only the distinct ones).

The product of its (nonzero) digits is 164640, while the sum is 42.

The spelling of 20713057728 in words is "twenty billion, seven hundred thirteen million, fifty-seven thousand, seven hundred twenty-eight".