20289497 has 2 divisors, whose sum is σ = 20289498. Its totient is φ = 20289496.

The previous prime is 20289463. The next prime is 20289509. The reversal of 20289497 is 79498202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20286016 + 3481 = 4504^2 + 59^2 .

It is a cyclic number.

It is not a de Polignac number, because 20289497 - 2¹⁰ = 20288473 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20285497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10144748 + 10144749.

It is an arithmetic number, because the mean of its divisors is an integer number (10144749).

Almost surely, 2^20289497 is an apocalyptic number.

It is an amenable number.

20289497 is a deficient number, since it is larger than the sum of its proper divisors (1).

20289497 is an equidigital number, since it uses as much as digits as its factorization.

20289497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 20289497 is about 4504.3864177044. The cubic root of 20289497 is about 272.7451857157.

The spelling of 20289497 in words is "twenty million, two hundred eighty-nine thousand, four hundred ninety-seven".