20798839 has 2 divisors, whose sum is σ = 20798840. Its totient is φ = 20798838.

The previous prime is 20798797. The next prime is 20798851. The reversal of 20798839 is 93889702.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20798839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20798879) 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, 10399419 + 10399420.

It is an arithmetic number, because the mean of its divisors is an integer number (10399420).

Almost surely, 2^20798839 is an apocalyptic number.

20798839 is a deficient number, since it is larger than the sum of its proper divisors (1).

20798839 is an equidigital number, since it uses as much as digits as its factorization.

20798839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 20798839 is about 4560.5744155753. The cubic root of 20798839 is about 275.0086564768.

The spelling of 20798839 in words is "twenty million, seven hundred ninety-eight thousand, eight hundred thirty-nine".