20636665706 has 8 divisors (see below), whose sum is σ = 30956709924. Its totient is φ = 10317762400.

The previous prime is 20636665667. The next prime is 20636665717. The reversal of 20636665706 is 60756663602.

It can be written as a sum of positive squares in 2 ways, for example, as 19897641481 + 739024225 = 141059^2 + 27185^2 .

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

It is a super-2 number, since 2×20636665706² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238475 + ... + 313278.

Almost surely, 2^20636665706 is an apocalyptic number.

20636665706 is a deficient number, since it is larger than the sum of its proper divisors (10320044218).

20636665706 is a wasteful number, since it uses less digits than its factorization.

20636665706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570456.

The product of its (nonzero) digits is 1632960, while the sum is 47.

The spelling of 20636665706 in words is "twenty billion, six hundred thirty-six million, six hundred sixty-five thousand, seven hundred six".