20727723161 has 8 divisors (see below), whose sum is σ = 22654969344. Its totient is φ = 18879140160.

The previous prime is 20727723157. The next prime is 20727723169. The reversal of 20727723161 is 16132772702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20727723161 - 2² = 20727723157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20727723169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19665245 + ... + 19666298.

It is an arithmetic number, because the mean of its divisors is an integer number (2831871168).

Almost surely, 2^20727723161 is an apocalyptic number.

It is an amenable number.

20727723161 is a deficient number, since it is larger than the sum of its proper divisors (1927246183).

20727723161 is a wasteful number, since it uses less digits than its factorization.

20727723161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39331591.

The product of its (nonzero) digits is 49392, while the sum is 38.

The spelling of 20727723161 in words is "twenty billion, seven hundred twenty-seven million, seven hundred twenty-three thousand, one hundred sixty-one".