20403665838384 has 120 divisors (see below), whose sum is σ = 56107405586688. Its totient is φ = 6388003906560.

The previous prime is 20403665838329. The next prime is 20403665838397. The reversal of 20403665838384 is 48383856630402.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5245549 + ... + 8265779.

Almost surely, 2^{20403665838384} is an apocalyptic number.

20403665838384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20403665838384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28053702793344).

20403665838384 is an abundant number, since it is smaller than the sum of its proper divisors (35703739748304).

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

20403665838384 is a wasteful number, since it uses less digits than its factorization.

20403665838384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3020763 (or 3020740 counting only the distinct ones).

The product of its (nonzero) digits is 79626240, while the sum is 60.

The spelling of 20403665838384 in words is "twenty trillion, four hundred three billion, six hundred sixty-five million, eight hundred thirty-eight thousand, three hundred eighty-four".