20606231066 has 4 divisors (see below), whose sum is σ = 30909346602. Its totient is φ = 10303115532.

The previous prime is 20606231021. The next prime is 20606231069. The reversal of 20606231066 is 66013260602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15084998041 + 5521233025 = 122821^2 + 74305^2 .

It is not an unprimeable number, because it can be changed into a prime (20606231069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5151557765 + ... + 5151557768.

Almost surely, 2^20606231066 is an apocalyptic number.

20606231066 is a deficient number, since it is larger than the sum of its proper divisors (10303115536).

20606231066 is a wasteful number, since it uses less digits than its factorization.

20606231066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10303115535.

The product of its (nonzero) digits is 15552, while the sum is 32.

Adding to 20606231066 its reverse (66013260602), we get a palindrome (86619491668).

The spelling of 20606231066 in words is "twenty billion, six hundred six million, two hundred thirty-one thousand, sixty-six".