20817852360 has 128 divisors (see below), whose sum is σ = 66082608000. Its totient is φ = 5231886336.

The previous prime is 20817852331. The next prime is 20817852403. The reversal of 20817852360 is 6325871802.

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, 416386 + ... + 463694.

It is an arithmetic number, because the mean of its divisors is an integer number (516270375).

Almost surely, 2^20817852360 is an apocalyptic number.

20817852360 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 20817852360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33041304000).

20817852360 is an abundant number, since it is smaller than the sum of its proper divisors (45264755640).

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

20817852360 is a wasteful number, since it uses less digits than its factorization.

20817852360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47535 (or 47531 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 20817852360 in words is "twenty billion, eight hundred seventeen million, eight hundred fifty-two thousand, three hundred sixty".