20799287 has 2 divisors, whose sum is σ = 20799288. Its totient is φ = 20799286.

The previous prime is 20799269. The next prime is 20799299. The reversal of 20799287 is 78299702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20799287 - 2⁶ = 20799223 is a prime.

It is a super-2 number, since 2×20799287² = 865220679416738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20799257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10399643 + 10399644.

It is an arithmetic number, because the mean of its divisors is an integer number (10399644).

Almost surely, 2^20799287 is an apocalyptic number.

20799287 is a deficient number, since it is larger than the sum of its proper divisors (1).

20799287 is an equidigital number, since it uses as much as digits as its factorization.

20799287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 20799287 is about 4560.6235319307. The cubic root of 20799287 is about 275.0106309940.

The spelling of 20799287 in words is "twenty million, seven hundred ninety-nine thousand, two hundred eighty-seven".