20906297 has 2 divisors, whose sum is σ = 20906298. Its totient is φ = 20906296.

The previous prime is 20906279. The next prime is 20906317. The reversal of 20906297 is 79260902.

Together with previous prime (20906279) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18800896 + 2105401 = 4336^2 + 1451^2 .

It is a cyclic number.

It is not a de Polignac number, because 20906297 - 2⁶ = 20906233 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20906227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10453148 + 10453149.

It is an arithmetic number, because the mean of its divisors is an integer number (10453149).

Almost surely, 2^20906297 is an apocalyptic number.

It is an amenable number.

20906297 is a deficient number, since it is larger than the sum of its proper divisors (1).

20906297 is an equidigital number, since it uses as much as digits as its factorization.

20906297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 20906297 is about 4572.3404291457. The cubic root of 20906297 is about 275.4814574209.

The spelling of 20906297 in words is "twenty million, nine hundred six thousand, two hundred ninety-seven".