20576161 has 2 divisors, whose sum is σ = 20576162. Its totient is φ = 20576160.

The previous prime is 20576141. The next prime is 20576189. The reversal of 20576161 is 16167502.

It is an a-pointer prime, because the next prime (20576189) can be obtained adding 20576161 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16966161 + 3610000 = 4119^2 + 1900^2 .

It is a cyclic number.

It is not a de Polignac number, because 20576161 - 2²¹ = 18479009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20576131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10288080 + 10288081.

It is an arithmetic number, because the mean of its divisors is an integer number (10288081).

Almost surely, 2^20576161 is an apocalyptic number.

It is an amenable number.

20576161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20576161 is an equidigital number, since it uses as much as digits as its factorization.

20576161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 20576161 is about 4536.0953473224. The cubic root of 20576161 is about 274.0236939391.

The spelling of 20576161 in words is "twenty million, five hundred seventy-six thousand, one hundred sixty-one".