20998303 has 2 divisors, whose sum is σ = 20998304. Its totient is φ = 20998302.

The previous prime is 20998297. The next prime is 20998387. The reversal of 20998303 is 30389902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20998303 - 2¹³ = 20990111 is a prime.

It is equal to p_1329856 and since 20998303 and 1329856 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20998603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10499151 + 10499152.

It is an arithmetic number, because the mean of its divisors is an integer number (10499152).

Almost surely, 2^20998303 is an apocalyptic number.

20998303 is a deficient number, since it is larger than the sum of its proper divisors (1).

20998303 is an equidigital number, since it uses as much as digits as its factorization.

20998303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 20998303 is about 4582.3905333352. The cubic root of 20998303 is about 275.8849858596.

The spelling of 20998303 in words is "twenty million, nine hundred ninety-eight thousand, three hundred three".