20992085338842 has 12 divisors (see below), whose sum is σ = 45482851567530. Its totient is φ = 6997361779608.

The previous prime is 20992085338841. The next prime is 20992085338927. The reversal of 20992085338842 is 24883358029902.

20992085338842 is a `hidden beast` number, since 2 + 0 + 9 + 9 + 208 + 5 + 3 + 388 + 42 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12428438109201 + 8563647229641 = 3525399^2 + 2926371^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20992085338842.

It is not an unprimeable number, because it can be changed into a prime (20992085338841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 583113481617 + ... + 583113481652.

Almost surely, 2^{20992085338842} is an apocalyptic number.

20992085338842 is an abundant number, since it is smaller than the sum of its proper divisors (24490766228688).

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

20992085338842 is a wasteful number, since it uses less digits than its factorization.

20992085338842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166226963277 (or 1166226963274 counting only the distinct ones).

The product of its (nonzero) digits is 59719680, while the sum is 63.

The spelling of 20992085338842 in words is "twenty trillion, nine hundred ninety-two billion, eighty-five million, three hundred thirty-eight thousand, eight hundred forty-two".