20782989311 has 24 divisors (see below), whose sum is σ = 25625720736. Its totient is φ = 16748121600.

The previous prime is 20782989301. The next prime is 20782989329. The reversal of 20782989311 is 11398928702.

It is not a de Polignac number, because 20782989311 - 2⁶ = 20782989247 is a prime.

It is a super-2 number, since 2×20782989311² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20782989311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20782989301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 792611 + ... + 818411.

It is an arithmetic number, because the mean of its divisors is an integer number (1067738364).

Almost surely, 2^20782989311 is an apocalyptic number.

20782989311 is a deficient number, since it is larger than the sum of its proper divisors (4842731425).

20782989311 is a wasteful number, since it uses less digits than its factorization.

20782989311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26799 (or 26792 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 50.

The spelling of 20782989311 in words is "twenty billion, seven hundred eighty-two million, nine hundred eighty-nine thousand, three hundred eleven".