20385285856 has 48 divisors (see below), whose sum is σ = 43235597664. Its totient is φ = 9405356544.

The previous prime is 20385285853. The next prime is 20385285911. The reversal of 20385285856 is 65858258302.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20385285853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1546365 + ... + 1559491.

It is an arithmetic number, because the mean of its divisors is an integer number (900741618).

Almost surely, 2^20385285856 is an apocalyptic number.

20385285856 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20385285856 is an abundant number, since it is smaller than the sum of its proper divisors (22850311808).

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

20385285856 is a wasteful number, since it uses less digits than its factorization.

20385285856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16883 (or 16875 counting only the distinct ones).

The product of its (nonzero) digits is 4608000, while the sum is 52.

The spelling of 20385285856 in words is "twenty billion, three hundred eighty-five million, two hundred eighty-five thousand, eight hundred fifty-six".