20853670463 has 4 divisors (see below), whose sum is σ = 20853959280. Its totient is φ = 20853381648.

The previous prime is 20853670441. The next prime is 20853670477. The reversal of 20853670463 is 36407635802.

It is a Cunningham number, because it is equal to 144408²-1.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20853670463 - 2⁶ = 20853670399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20853670423) 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, 72203 + ... + 216611.

It is an arithmetic number, because the mean of its divisors is an integer number (5213489820).

Almost surely, 2^20853670463 is an apocalyptic number.

20853670463 is a deficient number, since it is larger than the sum of its proper divisors (288817).

20853670463 is a wasteful number, since it uses less digits than its factorization.

20853670463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288816.

The product of its (nonzero) digits is 725760, while the sum is 44.

The spelling of 20853670463 in words is "twenty billion, eight hundred fifty-three million, six hundred seventy thousand, four hundred sixty-three".