20321055523445 has 32 divisors (see below), whose sum is σ = 24711505799904. Its totient is φ = 16040805580800.

The previous prime is 20321055523429. The next prime is 20321055523459. The reversal of 20321055523445 is 54432555012302.

It can be written as a sum of positive squares in 16 ways, for example, as 18201605799556 + 2119449723889 = 4266334^2 + 1455833^2 .

It is not a de Polignac number, because 20321055523445 - 2⁴ = 20321055523429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112691255 + ... + 112871435.

It is an arithmetic number, because the mean of its divisors is an integer number (772234556247).

Almost surely, 2^{20321055523445} is an apocalyptic number.

It is an amenable number.

20321055523445 is a deficient number, since it is larger than the sum of its proper divisors (4390450276459).

20321055523445 is a wasteful number, since it uses less digits than its factorization.

20321055523445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181193.

The product of its (nonzero) digits is 720000, while the sum is 41.

The spelling of 20321055523445 in words is "twenty trillion, three hundred twenty-one billion, fifty-five million, five hundred twenty-three thousand, four hundred forty-five".