20697241 has 2 divisors, whose sum is σ = 20697242. Its totient is φ = 20697240.

The previous prime is 20697203. The next prime is 20697253. The reversal of 20697241 is 14279602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15768841 + 4928400 = 3971^2 + 2220^2 .

It is a cyclic number.

It is not a de Polignac number, because 20697241 - 2⁷ = 20697113 is a prime.

It is not a weakly prime, because it can be changed into another prime (20697641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10348620 + 10348621.

It is an arithmetic number, because the mean of its divisors is an integer number (10348621).

Almost surely, 2^20697241 is an apocalyptic number.

It is an amenable number.

20697241 is a deficient number, since it is larger than the sum of its proper divisors (1).

20697241 is an equidigital number, since it uses as much as digits as its factorization.

20697241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 20697241 is about 4549.4220512061. The cubic root of 20697241 is about 274.5601386921.

The spelling of 20697241 in words is "twenty million, six hundred ninety-seven thousand, two hundred forty-one".