20649269 has 2 divisors, whose sum is σ = 20649270. Its totient is φ = 20649268.

The previous prime is 20649259. The next prime is 20649289. The reversal of 20649269 is 96294602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14212900 + 6436369 = 3770^2 + 2537^2 .

It is a cyclic number.

It is not a de Polignac number, because 20649269 - 2⁴ = 20649253 is a prime.

It is a super-2 number, since 2×20649269² = 852784620468722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20649229) 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, 10324634 + 10324635.

It is an arithmetic number, because the mean of its divisors is an integer number (10324635).

Almost surely, 2^20649269 is an apocalyptic number.

It is an amenable number.

20649269 is a deficient number, since it is larger than the sum of its proper divisors (1).

20649269 is an equidigital number, since it uses as much as digits as its factorization.

20649269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 20649269 is about 4544.1466745694. The cubic root of 20649269 is about 274.3478497184.

The spelling of 20649269 in words is "twenty million, six hundred forty-nine thousand, two hundred sixty-nine".