20647273 has 2 divisors, whose sum is σ = 20647274. Its totient is φ = 20647272.

The previous prime is 20647229. The next prime is 20647283. The reversal of 20647273 is 37274602.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18045504 + 2601769 = 4248^2 + 1613^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20647273 is a prime.

It is not a weakly prime, because it can be changed into another prime (20647283) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10323636 + 10323637.

It is an arithmetic number, because the mean of its divisors is an integer number (10323637).

Almost surely, 2^20647273 is an apocalyptic number.

It is an amenable number.

20647273 is a deficient number, since it is larger than the sum of its proper divisors (1).

20647273 is an equidigital number, since it uses as much as digits as its factorization.

20647273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 31.

The square root of 20647273 is about 4543.9270460693. The cubic root of 20647273 is about 274.3390097614.

The spelling of 20647273 in words is "twenty million, six hundred forty-seven thousand, two hundred seventy-three".