20890708066 has 8 divisors (see below), whose sum is σ = 31352279004. Its totient is φ = 10439948400.

The previous prime is 20890708057. The next prime is 20890708067. The reversal of 20890708066 is 66080709802.

It can be written as a sum of positive squares in 2 ways, for example, as 20787584041 + 103124025 = 144179^2 + 10155^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20890708067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2697985 + ... + 2705716.

Almost surely, 2^20890708066 is an apocalyptic number.

20890708066 is a deficient number, since it is larger than the sum of its proper divisors (10461570938).

20890708066 is a wasteful number, since it uses less digits than its factorization.

20890708066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5405636.

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 20890708066 in words is "twenty billion, eight hundred ninety million, seven hundred eight thousand, sixty-six".