20640104704 has 36 divisors (see below), whose sum is σ = 41237301420. Its totient is φ = 10310604800.

The previous prime is 20640104701. The next prime is 20640104729. The reversal of 20640104704 is 40740104602.

It can be written as a sum of positive squares in 2 ways, for example, as 4153544704 + 16486560000 = 64448^2 + 128400^2 .

It is not an unprimeable number, because it can be changed into a prime (20640104701) 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 3 ways as a sum of consecutive naturals, for example, 247554 + ... + 320254.

It is an arithmetic number, because the mean of its divisors is an integer number (1145480595).

Almost surely, 2^20640104704 is an apocalyptic number.

It is an amenable number.

20640104704 is a deficient number, since it is larger than the sum of its proper divisors (20597196716).

20640104704 is an equidigital number, since it uses as much as digits as its factorization.

20640104704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73826 (or 73812 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The spelling of 20640104704 in words is "twenty billion, six hundred forty million, one hundred four thousand, seven hundred four".