20825849856 has 180 divisors, whose sum is σ = 64608135648. Its totient is φ = 5949554688.

The previous prime is 20825849819. The next prime is 20825849893. The reversal of 20825849856 is 65894852802.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20825849819) and next prime (20825849893).

It is a junction number, because it is equal to n+sod(n) for n = 20825849796 and 20825849805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2404125 + ... + 2412771.

Almost surely, 2^20825849856 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 20825849856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32304067824).

20825849856 is an abundant number, since it is smaller than the sum of its proper divisors (43782285792).

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

20825849856 is an frugal number, since it uses more digits than its factorization.

20825849856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8692 (or 8659 counting only the distinct ones).

The product of its (nonzero) digits is 11059200, while the sum is 57.

The spelling of 20825849856 in words is "twenty billion, eight hundred twenty-five million, eight hundred forty-nine thousand, eight hundred fifty-six".