20993279266 has 8 divisors (see below), whose sum is σ = 31495659804. Its totient is φ = 10494726000.

The previous prime is 20993279231. The next prime is 20993279339. The reversal of 20993279266 is 66297239902.

It can be written as a sum of positive squares in 2 ways, for example, as 20715557041 + 277722225 = 143929^2 + 16665^2 .

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

It is a super-3 number, since 3×20993279266³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 943065 + ... + 965068.

Almost surely, 2^20993279266 is an apocalyptic number.

20993279266 is a deficient number, since it is larger than the sum of its proper divisors (10502380538).

20993279266 is a wasteful number, since it uses less digits than its factorization.

20993279266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1913636.

The product of its (nonzero) digits is 4408992, while the sum is 55.

The spelling of 20993279266 in words is "twenty billion, nine hundred ninety-three million, two hundred seventy-nine thousand, two hundred sixty-six".