20702497 has 2 divisors, whose sum is σ = 20702498. Its totient is φ = 20702496.

The previous prime is 20702483. The next prime is 20702519. The reversal of 20702497 is 79420702.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16638241 + 4064256 = 4079^2 + 2016^2 .

It is a cyclic number.

It is not a de Polignac number, because 20702497 - 2¹⁵ = 20669729 is a prime.

It is not a weakly prime, because it can be changed into another prime (20702477) 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, 10351248 + 10351249.

It is an arithmetic number, because the mean of its divisors is an integer number (10351249).

Almost surely, 2^20702497 is an apocalyptic number.

It is an amenable number.

20702497 is a deficient number, since it is larger than the sum of its proper divisors (1).

20702497 is an equidigital number, since it uses as much as digits as its factorization.

20702497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 20702497 is about 4549.9996703297. Note that the first 3 decimals coincide. The cubic root of 20702497 is about 274.5833779563.

The spelling of 20702497 in words is "twenty million, seven hundred two thousand, four hundred ninety-seven".