20604444240 has 80 divisors (see below), whose sum is σ = 64773461376. Its totient is φ = 5417126400.

The previous prime is 20604444199. The next prime is 20604444251. The reversal of 20604444240 is 4244440602.

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 (30).

It is a junction number, because it is equal to n+sod(n) for n = 20604444198 and 20604444207.

It is a congruent number.

It is an unprimeable number.

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, 587551 + ... + 621630.

Almost surely, 2^20604444240 is an apocalyptic number.

20604444240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20604444240 is an abundant number, since it is smaller than the sum of its proper divisors (44169017136).

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

20604444240 is a wasteful number, since it uses less digits than its factorization.

20604444240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209268 (or 1209262 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 30.

Adding to 20604444240 its reverse (4244440602), we get a palindrome (24848884842).

The spelling of 20604444240 in words is "twenty billion, six hundred four million, four hundred forty-four thousand, two hundred forty".