20383330644 has 96 divisors (see below), whose sum is σ = 56410905600. Its totient is φ = 6346136160.

The previous prime is 20383330637. The next prime is 20383330657. The reversal of 20383330644 is 44603338302.

20383330644 is a `hidden beast` number, since 2 + 0 + 3 + 8 + 3 + 3 + 3 + 0 + 644 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20383330599 and 20383330608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75739 + ... + 215645.

It is an arithmetic number, because the mean of its divisors is an integer number (587613600).

Almost surely, 2^20383330644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20383330644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28205452800).

20383330644 is an abundant number, since it is smaller than the sum of its proper divisors (36027574956).

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

20383330644 is a wasteful number, since it uses less digits than its factorization.

20383330644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140010 (or 140002 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 36.

Adding to 20383330644 its reverse (44603338302), we get a palindrome (64986668946).

The spelling of 20383330644 in words is "twenty billion, three hundred eighty-three million, three hundred thirty thousand, six hundred forty-four".