20779208992 has 24 divisors (see below), whose sum is σ = 42319727100. Its totient is φ = 10031341824.

The previous prime is 20779208981. The next prime is 20779208993. The reversal of 20779208992 is 29980297702.

It can be written as a sum of positive squares in 2 ways, for example, as 20562412816 + 216796176 = 143396^2 + 14724^2 .

It is not an unprimeable number, because it can be changed into a prime (20779208993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11194767 + ... + 11196622.

Almost surely, 2^20779208992 is an apocalyptic number.

It is an amenable number.

20779208992 is an abundant number, since it is smaller than the sum of its proper divisors (21540518108).

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

20779208992 is a wasteful number, since it uses less digits than its factorization.

20779208992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22391428 (or 22391420 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 55.

The spelling of 20779208992 in words is "twenty billion, seven hundred seventy-nine million, two hundred eight thousand, nine hundred ninety-two".