20871303680 has 80 divisors (see below), whose sum is σ = 50361921720. Its totient is φ = 8295186432.

The previous prime is 20871303613. The next prime is 20871303707. The reversal of 20871303680 is 8630317802.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 19434590464 + 1436713216 = 139408^2 + 37904^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×20871303680² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 375956 + ... + 427884.

Almost surely, 2^20871303680 is an apocalyptic number.

20871303680 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 20871303680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25180960860).

20871303680 is an abundant number, since it is smaller than the sum of its proper divisors (29490618040).

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

20871303680 is an equidigital number, since it uses as much as digits as its factorization.

20871303680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52109 (or 52093 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The spelling of 20871303680 in words is "twenty billion, eight hundred seventy-one million, three hundred three thousand, six hundred eighty".