20658504666 has 8 divisors (see below), whose sum is σ = 41317009344. Its totient is φ = 6886168220.

The previous prime is 20658504649. The next prime is 20658504667. The reversal of 20658504666 is 66640585602.

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

20658504666 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (20658504667) 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, 1721542050 + ... + 1721542061.

It is an arithmetic number, because the mean of its divisors is an integer number (5164626168).

Almost surely, 2^20658504666 is an apocalyptic number.

20658504666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20658504666 is a wasteful number, since it uses less digits than its factorization.

20658504666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3443084116.

The product of its (nonzero) digits is 2073600, while the sum is 48.

The spelling of 20658504666 in words is "twenty billion, six hundred fifty-eight million, five hundred four thousand, six hundred sixty-six".