20661540327 has 24 divisors (see below), whose sum is σ = 30897008064. Its totient is φ = 13296593664.

The previous prime is 20661540323. The next prime is 20661540373. The reversal of 20661540327 is 72304516602.

20661540327 is a `hidden beast` number, since 2 + 0 + 6 + 615 + 4 + 0 + 32 + 7 = 666.

It is not a de Polignac number, because 20661540327 - 2² = 20661540323 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20661540291 and 20661540300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20661540323) 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 23 ways as a sum of consecutive naturals, for example, 303678 + ... + 365435.

It is an arithmetic number, because the mean of its divisors is an integer number (1287375336).

Almost surely, 2^20661540327 is an apocalyptic number.

20661540327 is a deficient number, since it is larger than the sum of its proper divisors (10235467737).

20661540327 is a wasteful number, since it uses less digits than its factorization.

20661540327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669239 (or 669236 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The spelling of 20661540327 in words is "twenty billion, six hundred sixty-one million, five hundred forty thousand, three hundred twenty-seven".