20663456853 has 8 divisors (see below), whose sum is σ = 29670604768. Its totient is φ = 12715973424.

The previous prime is 20663456843. The next prime is 20663456861. The reversal of 20663456853 is 35865436602.

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

It is not a de Polignac number, because 20663456853 - 2⁶ = 20663456789 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 (20663456843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264916075 + ... + 264916152.

It is an arithmetic number, because the mean of its divisors is an integer number (3708825596).

Almost surely, 2^20663456853 is an apocalyptic number.

It is an amenable number.

20663456853 is a deficient number, since it is larger than the sum of its proper divisors (9007147915).

20663456853 is a wasteful number, since it uses less digits than its factorization.

20663456853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529832243.

The product of its (nonzero) digits is 3110400, while the sum is 48.

The spelling of 20663456853 in words is "twenty billion, six hundred sixty-three million, four hundred fifty-six thousand, eight hundred fifty-three".