20321303442556 has 6 divisors (see below), whose sum is σ = 35562281024480. Its totient is φ = 10160651721276.

The previous prime is 20321303442551. The next prime is 20321303442589. The reversal of 20321303442556 is 65524430312302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321303442551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2540162930316 + ... + 2540162930323.

Almost surely, 2^{20321303442556} is an apocalyptic number.

It is an amenable number.

20321303442556 is a deficient number, since it is larger than the sum of its proper divisors (15240977581924).

20321303442556 is a wasteful number, since it uses less digits than its factorization.

20321303442556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5080325860643 (or 5080325860641 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 40.

Adding to 20321303442556 its reverse (65524430312302), we get a palindrome (85845733754858).

The spelling of 20321303442556 in words is "twenty trillion, three hundred twenty-one billion, three hundred three million, four hundred forty-two thousand, five hundred fifty-six".