20735969 has 2 divisors, whose sum is σ = 20735970. Its totient is φ = 20735968.

The previous prime is 20735927. The next prime is 20736017. The reversal of 20735969 is 96953702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20566225 + 169744 = 4535^2 + 412^2 .

It is a cyclic number.

It is not a de Polignac number, because 20735969 - 2⁸ = 20735713 is a prime.

It is a super-2 number, since 2×20735969² = 859960820737922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20735069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10367984 + 10367985.

It is an arithmetic number, because the mean of its divisors is an integer number (10367985).

Almost surely, 2^20735969 is an apocalyptic number.

It is an amenable number.

20735969 is a deficient number, since it is larger than the sum of its proper divisors (1).

20735969 is an equidigital number, since it uses as much as digits as its factorization.

20735969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 41.

The square root of 20735969 is about 4553.6764268007. The cubic root of 20735969 is about 274.7312813063.

The spelling of 20735969 in words is "twenty million, seven hundred thirty-five thousand, nine hundred sixty-nine".