820769903 has 4 divisors (see below), whose sum is σ = 823205760. Its totient is φ = 818334048.

The previous prime is 820769897. The next prime is 820769959. The reversal of 820769903 is 309967028.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 820769903 - 2⁸ = 820769647 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 (820769993) 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 3 ways as a sum of consecutive naturals, for example, 1217423 + ... + 1218096.

It is an arithmetic number, because the mean of its divisors is an integer number (205801440).

Almost surely, 2^820769903 is an apocalyptic number.

820769903 is a deficient number, since it is larger than the sum of its proper divisors (2435857).

820769903 is a wasteful number, since it uses less digits than its factorization.

820769903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2435856.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 820769903 is about 28649.0820620836. The cubic root of 820769903 is about 936.2830063058.

The spelling of 820769903 in words is "eight hundred twenty million, seven hundred sixty-nine thousand, nine hundred three".