20998297 has 2 divisors, whose sum is σ = 20998298. Its totient is φ = 20998296.

The previous prime is 20998267. The next prime is 20998303. The reversal of 20998297 is 79289902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19678096 + 1320201 = 4436^2 + 1149^2 .

It is a cyclic number.

It is not a de Polignac number, because 20998297 - 2⁷ = 20998169 is a prime.

It is not a weakly prime, because it can be changed into another prime (20998267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10499148 + 10499149.

It is an arithmetic number, because the mean of its divisors is an integer number (10499149).

Almost surely, 2^20998297 is an apocalyptic number.

It is an amenable number.

20998297 is a deficient number, since it is larger than the sum of its proper divisors (1).

20998297 is an equidigital number, since it uses as much as digits as its factorization.

20998297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 20998297 is about 4582.3898786550. The cubic root of 20998297 is about 275.8849595827.

The spelling of 20998297 in words is "twenty million, nine hundred ninety-eight thousand, two hundred ninety-seven".