20324406660561 has 32 divisors (see below), whose sum is σ = 31419722987520. Its totient is φ = 12960346676112.

The previous prime is 20324406660553. The next prime is 20324406660563. The reversal of 20324406660561 is 16506660442302.

It is a happy number.

It is not a de Polignac number, because 20324406660561 - 2³ = 20324406660553 is a prime.

It is a super-4 number, since 4×20324406660561⁴ (a number of 54 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (20324406660563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98364420 + ... + 98570826.

It is an arithmetic number, because the mean of its divisors is an integer number (981866343360).

Almost surely, 2^{20324406660561} is an apocalyptic number.

It is an amenable number.

20324406660561 is a deficient number, since it is larger than the sum of its proper divisors (11095316326959).

20324406660561 is a wasteful number, since it uses less digits than its factorization.

20324406660561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365002 (or 364996 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 45.

The spelling of 20324406660561 in words is "twenty trillion, three hundred twenty-four billion, four hundred six million, six hundred sixty thousand, five hundred sixty-one".