820733685 has 16 divisors (see below), whose sum is σ = 1320053760. Its totient is φ = 435431360.

The previous prime is 820733681. The next prime is 820733687. The reversal of 820733685 is 586337028.

It is not a de Polignac number, because 820733685 - 2² = 820733681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820733681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140370 + ... + 146099.

It is an arithmetic number, because the mean of its divisors is an integer number (82503360).

Almost surely, 2^820733685 is an apocalyptic number.

It is an amenable number.

820733685 is a deficient number, since it is larger than the sum of its proper divisors (499320075).

820733685 is a wasteful number, since it uses less digits than its factorization.

820733685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286668.

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 820733685 is about 28648.4499580693. The cubic root of 820733685 is about 936.2692343596.

It can be divided in two parts, 82073 and 3685, that added together give a palindrome (85758).

The spelling of 820733685 in words is "eight hundred twenty million, seven hundred thirty-three thousand, six hundred eighty-five".