20893261 has 2 divisors, whose sum is σ = 20893262. Its totient is φ = 20893260.

The previous prime is 20893237. The next prime is 20893267. The reversal of 20893261 is 16239802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20196036 + 697225 = 4494^2 + 835^2 .

It is a cyclic number.

It is not a de Polignac number, because 20893261 - 2⁹ = 20892749 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20893267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10446630 + 10446631.

It is an arithmetic number, because the mean of its divisors is an integer number (10446631).

Almost surely, 2^20893261 is an apocalyptic number.

It is an amenable number.

20893261 is a deficient number, since it is larger than the sum of its proper divisors (1).

20893261 is an equidigital number, since it uses as much as digits as its factorization.

20893261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 20893261 is about 4570.9146787049. The cubic root of 20893261 is about 275.4241872285.

The spelling of 20893261 in words is "twenty million, eight hundred ninety-three thousand, two hundred sixty-one".