20011320320 has 88 divisors (see below), whose sum is σ = 48095083800. Its totient is φ = 7989297152.

The previous prime is 20011320319. The next prime is 20011320359. The reversal of 20011320320 is 2302311002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 750321664 + 19260998656 = 27392^2 + 138784^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20011320295 and 20011320304.

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, 2909846 + ... + 2916714.

Almost surely, 2^20011320320 is an apocalyptic number.

20011320320 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 20011320320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24047541900).

20011320320 is an abundant number, since it is smaller than the sum of its proper divisors (28083763480).

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

20011320320 is an equidigital number, since it uses as much as digits as its factorization.

20011320320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7463 (or 7445 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 20011320320 its reverse (2302311002), we get a palindrome (22313631322).

The spelling of 20011320320 in words is "twenty billion, eleven million, three hundred twenty thousand, three hundred twenty".