20397581060 has 24 divisors (see below), whose sum is σ = 43643128536. Its totient is φ = 8005088000.

The previous prime is 20397581051. The next prime is 20397581063. The reversal of 20397581060 is 6018579302.

It can be written as a sum of positive squares in 4 ways, for example, as 3852933184 + 16544647876 = 62072^2 + 128626^2 .

It is a super-2 number, since 2×20397581060² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20397580999 and 20397581017.

It is not an unprimeable number, because it can be changed into a prime (20397581063) 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 7 ways as a sum of consecutive naturals, for example, 9620441 + ... + 9622560.

It is an arithmetic number, because the mean of its divisors is an integer number (1818463689).

Almost surely, 2^20397581060 is an apocalyptic number.

20397581060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20397581060 is an abundant number, since it is smaller than the sum of its proper divisors (23245547476).

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

20397581060 is a wasteful number, since it uses less digits than its factorization.

20397581060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19243063 (or 19243061 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 20397581060 in words is "twenty billion, three hundred ninety-seven million, five hundred eighty-one thousand, sixty".