20711556112 has 80 divisors (see below), whose sum is σ = 43733419632. Its totient is φ = 9445017600.

The previous prime is 20711556083. The next prime is 20711556121. The reversal of 20711556112 is 21165511702.

It can be written as a sum of positive squares in 8 ways, for example, as 1022976256 + 19688579856 = 31984^2 + 140316^2 .

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, 16742758 + ... + 16743994.

Almost surely, 2^20711556112 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 20711556112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21866709816).

20711556112 is an abundant number, since it is smaller than the sum of its proper divisors (23021863520).

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

20711556112 is a wasteful number, since it uses less digits than its factorization.

20711556112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2156 (or 2150 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 31.

The spelling of 20711556112 in words is "twenty billion, seven hundred eleven million, five hundred fifty-six thousand, one hundred twelve".