20285612785 has 16 divisors (see below), whose sum is σ = 25072362000. Its totient is φ = 15744589056.

The previous prime is 20285612777. The next prime is 20285612819. The reversal of 20285612785 is 58721658202.

It can be written as a sum of positive squares in 8 ways, for example, as 146313216 + 20139299569 = 12096^2 + 141913^2 .

It is a cyclic number.

It is not a de Polignac number, because 20285612785 - 2³ = 20285612777 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92530 + ... + 221659.

It is an arithmetic number, because the mean of its divisors is an integer number (1567022625).

Almost surely, 2^20285612785 is an apocalyptic number.

It is an amenable number.

20285612785 is a deficient number, since it is larger than the sum of its proper divisors (4786749215).

20285612785 is a wasteful number, since it uses less digits than its factorization.

20285612785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314580.

The product of its (nonzero) digits is 537600, while the sum is 46.

The spelling of 20285612785 in words is "twenty billion, two hundred eighty-five million, six hundred twelve thousand, seven hundred eighty-five".