20640176560 has 40 divisors (see below), whose sum is σ = 48237091200. Its totient is φ = 8213286912.

The previous prime is 20640176549. The next prime is 20640176569. The reversal of 20640176560 is 6567104602.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (20640176569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 652960 + ... + 683839.

It is an arithmetic number, because the mean of its divisors is an integer number (1205927280).

Almost surely, 2^20640176560 is an apocalyptic number.

20640176560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20640176560 is an abundant number, since it is smaller than the sum of its proper divisors (27596914640).

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

20640176560 is a wasteful number, since it uses less digits than its factorization.

20640176560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337005 (or 1336999 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 37.

The spelling of 20640176560 in words is "twenty billion, six hundred forty million, one hundred seventy-six thousand, five hundred sixty".