20085471840 has 192 divisors, whose sum is σ = 73054324224. Its totient is φ = 4543561728.

The previous prime is 20085471839. The next prime is 20085471877. The reversal of 20085471840 is 4817458002.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 295107 + ... + 356733.

It is an arithmetic number, because the mean of its divisors is an integer number (380491272).

Almost surely, 2^20085471840 is an apocalyptic number.

20085471840 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 20085471840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36527162112).

20085471840 is an abundant number, since it is smaller than the sum of its proper divisors (52968852384).

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

20085471840 is a wasteful number, since it uses less digits than its factorization.

20085471840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61749 (or 61741 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 39.

The spelling of 20085471840 in words is "twenty billion, eighty-five million, four hundred seventy-one thousand, eight hundred forty".