20657293 has 2 divisors, whose sum is σ = 20657294. Its totient is φ = 20657292.

The previous prime is 20657281. The next prime is 20657297. The reversal of 20657293 is 39275602.

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., 15896169 + 4761124 = 3987^2 + 2182^2 .

It is a cyclic number.

It is not a de Polignac number, because 20657293 - 2¹⁷ = 20526221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20657297) 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, 10328646 + 10328647.

It is an arithmetic number, because the mean of its divisors is an integer number (10328647).

Almost surely, 2^20657293 is an apocalyptic number.

It is an amenable number.

20657293 is a deficient number, since it is larger than the sum of its proper divisors (1).

20657293 is an equidigital number, since it uses as much as digits as its factorization.

20657293 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 20657293 is about 4545.0294828527. The cubic root of 20657293 is about 274.3833809531.

The spelling of 20657293 in words is "twenty million, six hundred fifty-seven thousand, two hundred ninety-three".