20518335344 has 20 divisors (see below), whose sum is σ = 42812296296. Its totient is φ = 9470000832.

The previous prime is 20518335329. The next prime is 20518335367. The reversal of 20518335344 is 44353381502.

It is a junction number, because it is equal to n+sod(n) for n = 20518335298 and 20518335307.

It is a congruent number.

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, 49322714 + ... + 49323129.

Almost surely, 2^20518335344 is an apocalyptic number.

It is an amenable number.

20518335344 is an abundant number, since it is smaller than the sum of its proper divisors (22293960952).

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

20518335344 is a wasteful number, since it uses less digits than its factorization.

20518335344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98645864 (or 98645858 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 38.

The spelling of 20518335344 in words is "twenty billion, five hundred eighteen million, three hundred thirty-five thousand, three hundred forty-four".