20315320560 has 80 divisors (see below), whose sum is σ = 69975000480. Its totient is φ = 5417418240.

The previous prime is 20315320559. The next prime is 20315320567. The reversal of 20315320560 is 6502351302.

20315320560 is a `hidden beast` number, since 2 + 0 + 31 + 53 + 20 + 560 = 666.

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

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20315320567) 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 15 ways as a sum of consecutive naturals, for example, 4700461 + ... + 4704780.

It is an arithmetic number, because the mean of its divisors is an integer number (874687506).

Almost surely, 2^20315320560 is an apocalyptic number.

20315320560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20315320560 is an abundant number, since it is smaller than the sum of its proper divisors (49659679920).

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

20315320560 is a wasteful number, since it uses less digits than its factorization.

20315320560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9405263 (or 9405251 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

Adding to 20315320560 its reverse (6502351302), we get a palindrome (26817671862).

The spelling of 20315320560 in words is "twenty billion, three hundred fifteen million, three hundred twenty thousand, five hundred sixty".