20839799 has 8 divisors (see below), whose sum is σ = 21127392. Its totient is φ = 20554240.

The previous prime is 20839757. The next prime is 20839801. The reversal of 20839799 is 99793802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20839799 - 2⁸ = 20839543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20839729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34847 + ... + 35439.

It is an arithmetic number, because the mean of its divisors is an integer number (2640924).

Almost surely, 2^20839799 is an apocalyptic number.

20839799 is a deficient number, since it is larger than the sum of its proper divisors (287593).

20839799 is a wasteful number, since it uses less digits than its factorization.

20839799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 20839799 is about 4565.0628692275. The cubic root of 20839799 is about 275.1890666782.

The spelling of 20839799 in words is "twenty million, eight hundred thirty-nine thousand, seven hundred ninety-nine".