20856725748 has 96 divisors (see below), whose sum is σ = 55443507840. Its totient is φ = 6776352000.

The previous prime is 20856725741. The next prime is 20856725753. The reversal of 20856725748 is 84752765802.

20856725748 is a `hidden beast` number, since 2 + 0 + 8 + 5 + 67 + 2 + 574 + 8 = 666.

It is a super-3 number, since 3×20856725748³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 20856725694 and 20856725703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20856725741) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8239243 + ... + 8241773.

It is an arithmetic number, because the mean of its divisors is an integer number (577536540).

Almost surely, 2^20856725748 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 20856725748, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27721753920).

20856725748 is an abundant number, since it is smaller than the sum of its proper divisors (34586782092).

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

20856725748 is a wasteful number, since it uses less digits than its factorization.

20856725748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4446 (or 4438 counting only the distinct ones).

The product of its (nonzero) digits is 7526400, while the sum is 54.

The spelling of 20856725748 in words is "twenty billion, eight hundred fifty-six million, seven hundred twenty-five thousand, seven hundred forty-eight".