20665284686 has 8 divisors (see below), whose sum is σ = 31001359584. Its totient is φ = 10331498160.

The previous prime is 20665284671. The next prime is 20665284691. The reversal of 20665284686 is 68648256602.

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

It is a super-2 number, since 2×20665284686² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 549335 + ... + 585746.

It is an arithmetic number, because the mean of its divisors is an integer number (3875169948).

Almost surely, 2^20665284686 is an apocalyptic number.

20665284686 is a deficient number, since it is larger than the sum of its proper divisors (10336074898).

20665284686 is a wasteful number, since it uses less digits than its factorization.

20665284686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144186.

The product of its (nonzero) digits is 6635520, while the sum is 53.

The spelling of 20665284686 in words is "twenty billion, six hundred sixty-five million, two hundred eighty-four thousand, six hundred eighty-six".