20091103785 has 128 divisors (see below), whose sum is σ = 38916864000. Its totient is φ = 9799439616.

The previous prime is 20091103763. The next prime is 20091103787. The reversal of 20091103785 is 58730119002.

It is not a de Polignac number, because 20091103785 - 2¹⁶ = 20091038249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20091103787) by changing a digit.

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 127 ways as a sum of consecutive naturals, for example, 13191034 + ... + 13192556.

It is an arithmetic number, because the mean of its divisors is an integer number (304038000).

Almost surely, 2^20091103785 is an apocalyptic number.

It is an amenable number.

20091103785 is a deficient number, since it is larger than the sum of its proper divisors (18825760215).

20091103785 is a wasteful number, since it uses less digits than its factorization.

20091103785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1732 (or 1726 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The spelling of 20091103785 in words is "twenty billion, ninety-one million, one hundred three thousand, seven hundred eighty-five".