20665360263 has 8 divisors (see below), whose sum is σ = 27558715648. Its totient is φ = 13774455864.

The previous prime is 20665360253. The next prime is 20665360291. The reversal of 20665360263 is 36206356602.

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

It is not a de Polignac number, because 20665360263 - 2⁵ = 20665360231 is a prime.

It is a super-2 number, since 2×20665360263² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20665360253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 592981 + ... + 626862.

It is an arithmetic number, because the mean of its divisors is an integer number (3444839456).

Almost surely, 2^20665360263 is an apocalyptic number.

20665360263 is a deficient number, since it is larger than the sum of its proper divisors (6893355385).

20665360263 is a wasteful number, since it uses less digits than its factorization.

20665360263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1225493.

The product of its (nonzero) digits is 233280, while the sum is 39.

The spelling of 20665360263 in words is "twenty billion, six hundred sixty-five million, three hundred sixty thousand, two hundred sixty-three".