20739438720 has 1536 divisors, whose sum is σ = 100279872000. Its totient is φ = 3941498880.

The previous prime is 20739438719. The next prime is 20739438737. The reversal of 20739438720 is 2783493702.

20739438720 is a `hidden beast` number, since 207 + 3 + 9 + 438 + 7 + 2 + 0 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 190270026 + ... + 190270134.

It is an arithmetic number, because the mean of its divisors is an integer number (65286375).

Almost surely, 2^20739438720 is an apocalyptic number.

20739438720 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 20739438720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50139936000).

20739438720 is an abundant number, since it is smaller than the sum of its proper divisors (79540433280).

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

20739438720 is a wasteful number, since it uses less digits than its factorization.

20739438720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179 (or 150 counting only the distinct ones).

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

The spelling of 20739438720 in words is "twenty billion, seven hundred thirty-nine million, four hundred thirty-eight thousand, seven hundred twenty".