20782989312 has 120 divisors (see below), whose sum is σ = 55592754336. Its totient is φ = 6906052608.

The previous prime is 20782989301. The next prime is 20782989329. The reversal of 20782989312 is 21398928702.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26885758 + ... + 26886530.

Almost surely, 2^20782989312 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 20782989312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27796377168).

20782989312 is an abundant number, since it is smaller than the sum of its proper divisors (34809765024).

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

20782989312 is an frugal number, since it uses more digits than its factorization.

20782989312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351 (or 1325 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 51.

The spelling of 20782989312 in words is "twenty billion, seven hundred eighty-two million, nine hundred eighty-nine thousand, three hundred twelve".