20739784320 has 320 divisors, whose sum is σ = 74777709600. Its totient is φ = 5477455872.

The previous prime is 20739784313. The next prime is 20739784379. The reversal of 20739784320 is 2348793702.

20739784320 is a `hidden beast` number, since 207 + 3 + 9 + 7 + 8 + 432 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (320).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5545011 + ... + 5548749.

Almost surely, 2^20739784320 is an apocalyptic number.

20739784320 is a gapful number since it is divisible by the number (20) 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 20739784320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37388854800).

20739784320 is an abundant number, since it is smaller than the sum of its proper divisors (54037925280).

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

20739784320 is a wasteful number, since it uses less digits than its factorization.

20739784320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3877 (or 3856 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 45.

The spelling of 20739784320 in words is "twenty billion, seven hundred thirty-nine million, seven hundred eighty-four thousand, three hundred twenty".