20789025856 has 63 divisors (see below), whose sum is σ = 42034392309. Its totient is φ = 10201306368.

The previous prime is 20789025833. The next prime is 20789025877. The reversal of 20789025856 is 65852098702.

The square root of 20789025856 is 144184.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1367816256 + 19421209600 = 36984^2 + 139360^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 77282490 + ... + 77282758.

Almost surely, 2^20789025856 is an apocalyptic number.

20789025856 is the 144184-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20789025856

20789025856 is an abundant number, since it is smaller than the sum of its proper divisors (21245366453).

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

20789025856 is an frugal number, since it uses more digits than its factorization.

20789025856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684 (or 338 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 52.

The spelling of 20789025856 in words is "twenty billion, seven hundred eighty-nine million, twenty-five thousand, eight hundred fifty-six".