20800779 has 8 divisors (see below), whose sum is σ = 28085760. Its totient is φ = 13691496.

The previous prime is 20800739. The next prime is 20800807. The reversal of 20800779 is 97700802.

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

It is not a de Polignac number, because 20800779 - 2⁸ = 20800523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20800709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43647 + ... + 44120.

It is an arithmetic number, because the mean of its divisors is an integer number (3510720).

Almost surely, 2^20800779 is an apocalyptic number.

20800779 is a deficient number, since it is larger than the sum of its proper divisors (7284981).

20800779 is an equidigital number, since it uses as much as digits as its factorization.

20800779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87849.

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 20800779 is about 4560.7871031216. The cubic root of 20800779 is about 275.0172066369.

The spelling of 20800779 in words is "twenty million, eight hundred thousand, seven hundred seventy-nine".