20321556604 has 24 divisors (see below), whose sum is σ = 36718012800. Its totient is φ = 9830840640.

The previous prime is 20321556601. The next prime is 20321556649. The reversal of 20321556604 is 40665512302.

It is a self number, because there is not a number n which added to its sum of digits gives 20321556604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321556601) 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, 642882 + ... + 673750.

It is an arithmetic number, because the mean of its divisors is an integer number (1529917200).

Almost surely, 2^20321556604 is an apocalyptic number.

It is an amenable number.

20321556604 is a deficient number, since it is larger than the sum of its proper divisors (16396456196).

20321556604 is a wasteful number, since it uses less digits than its factorization.

20321556604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36213 (or 36211 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

It can be divided in two parts, 20 and 321556604, that added together give a square (321556624 = 17932²).

The spelling of 20321556604 in words is "twenty billion, three hundred twenty-one million, five hundred fifty-six thousand, six hundred four".