20894161 has 2 divisors, whose sum is σ = 20894162. Its totient is φ = 20894160.

The previous prime is 20894149. The next prime is 20894183. The reversal of 20894161 is 16149802.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20430400 + 463761 = 4520^2 + 681^2 .

It is a cyclic number.

It is not a de Polignac number, because 20894161 - 2¹⁹ = 20369873 is a prime.

It is not a weakly prime, because it can be changed into another prime (20894131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10447080 + 10447081.

It is an arithmetic number, because the mean of its divisors is an integer number (10447081).

Almost surely, 2^20894161 is an apocalyptic number.

It is an amenable number.

20894161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20894161 is an equidigital number, since it uses as much as digits as its factorization.

20894161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 20894161 is about 4571.0131262117. The cubic root of 20894161 is about 275.4281419041.

The spelling of 20894161 in words is "twenty million, eight hundred ninety-four thousand, one hundred sixty-one".