20136969585 has 24 divisors (see below), whose sum is σ = 35056518120. Its totient is φ = 10692813312.

The previous prime is 20136969533. The next prime is 20136969599. The reversal of 20136969585 is 58596963102.

It is a happy number.

20136969585 is a `hidden beast` number, since 20 + 1 + 36 + 9 + 6 + 9 + 585 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1075577616 + 19061391969 = 32796^2 + 138063^2 .

It is not a de Polignac number, because 20136969585 - 2¹³ = 20136961393 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 966744 + ... + 987353.

It is an arithmetic number, because the mean of its divisors is an integer number (1460688255).

Almost surely, 2^20136969585 is an apocalyptic number.

It is an amenable number.

20136969585 is a deficient number, since it is larger than the sum of its proper divisors (14919548535).

20136969585 is a wasteful number, since it uses less digits than its factorization.

20136969585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1954337 (or 1954334 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 54.

The spelling of 20136969585 in words is "twenty billion, one hundred thirty-six million, nine hundred sixty-nine thousand, five hundred eighty-five".