20311384560 has 160 divisors (see below), whose sum is σ = 66370752000. Its totient is φ = 5124215808.

The previous prime is 20311384553. The next prime is 20311384567. The reversal of 20311384560 is 6548311302.

It is an interprime number because it is at equal distance from previous prime (20311384553) and next prime (20311384567).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311384567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3823186 + ... + 3828494.

It is an arithmetic number, because the mean of its divisors is an integer number (414817200).

Almost surely, 2^20311384560 is an apocalyptic number.

20311384560 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 20311384560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33185376000).

20311384560 is an abundant number, since it is smaller than the sum of its proper divisors (46059367440).

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

20311384560 is a wasteful number, since it uses less digits than its factorization.

20311384560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6183 (or 6177 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

Adding to 20311384560 its reverse (6548311302), we get a palindrome (26859695862).

The spelling of 20311384560 in words is "twenty billion, three hundred eleven million, three hundred eighty-four thousand, five hundred sixty".