20847178220 has 96 divisors (see below), whose sum is σ = 50108792832. Its totient is φ = 7215840000.

The previous prime is 20847178181. The next prime is 20847178243. The reversal of 20847178220 is 2287174802.

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, 390965 + ... + 441075.

It is an arithmetic number, because the mean of its divisors is an integer number (521966592).

Almost surely, 2^20847178220 is an apocalyptic number.

20847178220 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 20847178220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25054396416).

20847178220 is an abundant number, since it is smaller than the sum of its proper divisors (29261614612).

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

20847178220 is a wasteful number, since it uses less digits than its factorization.

20847178220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50223 (or 50221 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 41.

The spelling of 20847178220 in words is "twenty billion, eight hundred forty-seven million, one hundred seventy-eight thousand, two hundred twenty".