20646135848 has 16 divisors (see below), whose sum is σ = 41689312980. Its totient is φ = 9528985728.

The previous prime is 20646135791. The next prime is 20646135859. The reversal of 20646135848 is 84853164602.

It can be written as a sum of positive squares in 2 ways, for example, as 20334189604 + 311946244 = 142598^2 + 17662^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99260165 + ... + 99260372.

Almost surely, 2^20646135848 is an apocalyptic number.

It is an amenable number.

20646135848 is an abundant number, since it is smaller than the sum of its proper divisors (21043177132).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20646135848 is a wasteful number, since it uses less digits than its factorization.

20646135848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198520556 (or 198520552 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 47.

The spelling of 20646135848 in words is "twenty billion, six hundred forty-six million, one hundred thirty-five thousand, eight hundred forty-eight".