20696549 has 2 divisors, whose sum is σ = 20696550. Its totient is φ = 20696548.

The previous prime is 20696521. The next prime is 20696581. The reversal of 20696549 is 94569602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15602500 + 5094049 = 3950^2 + 2257^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20696549 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 (20636549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10348274 + 10348275.

It is an arithmetic number, because the mean of its divisors is an integer number (10348275).

Almost surely, 2^20696549 is an apocalyptic number.

It is an amenable number.

20696549 is a deficient number, since it is larger than the sum of its proper divisors (1).

20696549 is an equidigital number, since it uses as much as digits as its factorization.

20696549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 20696549 is about 4549.3459969538. The cubic root of 20696549 is about 274.5570787395.

The spelling of 20696549 in words is "twenty million, six hundred ninety-six thousand, five hundred forty-nine".