20866563910 has 8 divisors (see below), whose sum is σ = 37559815056. Its totient is φ = 8346625560.

The previous prime is 20866563889. The next prime is 20866563937. The reversal of 20866563910 is 1936566802.

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

It is a super-2 number, since 2×20866563910² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1043328186 + ... + 1043328205.

It is an arithmetic number, because the mean of its divisors is an integer number (4694976882).

Almost surely, 2^20866563910 is an apocalyptic number.

20866563910 is a deficient number, since it is larger than the sum of its proper divisors (16693251146).

20866563910 is a wasteful number, since it uses less digits than its factorization.

20866563910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2086656398.

The product of its (nonzero) digits is 466560, while the sum is 46.

The spelling of 20866563910 in words is "twenty billion, eight hundred sixty-six million, five hundred sixty-three thousand, nine hundred ten".