20696257 has 2 divisors, whose sum is σ = 20696258. Its totient is φ = 20696256.

The previous prime is 20696243. The next prime is 20696279. The reversal of 20696257 is 75269602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10653696 + 10042561 = 3264^2 + 3169^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20696257 is a prime.

It is not a weakly prime, because it can be changed into another prime (20696057) 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, 10348128 + 10348129.

It is an arithmetic number, because the mean of its divisors is an integer number (10348129).

Almost surely, 2^20696257 is an apocalyptic number.

It is an amenable number.

20696257 is a deficient number, since it is larger than the sum of its proper divisors (1).

20696257 is an equidigital number, since it uses as much as digits as its factorization.

20696257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 20696257 is about 4549.3139043157. The cubic root of 20696257 is about 274.5557875251. Note that the first 3 decimals are identical.

The spelling of 20696257 in words is "twenty million, six hundred ninety-six thousand, two hundred fifty-seven".