20179321745 has 32 divisors (see below), whose sum is σ = 27942845184. Its totient is φ = 13845427200.

The previous prime is 20179321711. The next prime is 20179321751. The reversal of 20179321745 is 54712397102.

It is a happy number.

It is not a de Polignac number, because 20179321745 - 2⁶ = 20179321681 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16916 + ... + 201605.

It is an arithmetic number, because the mean of its divisors is an integer number (873213912).

Almost surely, 2^20179321745 is an apocalyptic number.

It is an amenable number.

20179321745 is a deficient number, since it is larger than the sum of its proper divisors (7763523439).

20179321745 is a wasteful number, since it uses less digits than its factorization.

20179321745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218633.

The product of its (nonzero) digits is 105840, while the sum is 41.

The spelling of 20179321745 in words is "twenty billion, one hundred seventy-nine million, three hundred twenty-one thousand, seven hundred forty-five".