20990846105 has 8 divisors (see below), whose sum is σ = 25869799752. Its totient is φ = 16338820608.

The previous prime is 20990846057. The next prime is 20990846117. The reversal of 20990846105 is 50164809902.

It can be written as a sum of positive squares in 4 ways, for example, as 8602933504 + 12387912601 = 92752^2 + 111301^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20990846105 - 2¹⁴ = 20990829721 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56731832 + ... + 56732201.

It is an arithmetic number, because the mean of its divisors is an integer number (3233724969).

Almost surely, 2^20990846105 is an apocalyptic number.

It is an amenable number.

20990846105 is a deficient number, since it is larger than the sum of its proper divisors (4878953647).

20990846105 is a wasteful number, since it uses less digits than its factorization.

20990846105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113464075.

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 20990846105 in words is "twenty billion, nine hundred ninety million, eight hundred forty-six thousand, one hundred five".