20321776582544 has 40 divisors (see below), whose sum is σ = 40332944984640. Its totient is φ = 9913788920448.

The previous prime is 20321776582529. The next prime is 20321776582561. The reversal of 20321776582544 is 44528567712302.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20321776582544.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15438167 + ... + 16702710.

It is an arithmetic number, because the mean of its divisors is an integer number (1008323624616).

Almost surely, 2^{20321776582544} is an apocalyptic number.

It is an amenable number.

20321776582544 is a deficient number, since it is larger than the sum of its proper divisors (20011168402096).

20321776582544 is a wasteful number, since it uses less digits than its factorization.

20321776582544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32141847 (or 32141841 counting only the distinct ones).

The product of its (nonzero) digits is 22579200, while the sum is 56.

The spelling of 20321776582544 in words is "twenty trillion, three hundred twenty-one billion, seven hundred seventy-six million, five hundred eighty-two thousand, five hundred forty-four".