820341853 has 4 divisors (see below), whose sum is σ = 863517760. Its totient is φ = 777165948.

The previous prime is 820341833. The next prime is 820341857. The reversal of 820341853 is 358143028.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 820341853 - 2²¹ = 818244701 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 (820341857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21587925 + ... + 21587962.

It is an arithmetic number, because the mean of its divisors is an integer number (215879440).

Almost surely, 2^820341853 is an apocalyptic number.

It is an amenable number.

820341853 is a deficient number, since it is larger than the sum of its proper divisors (43175907).

820341853 is a wasteful number, since it uses less digits than its factorization.

820341853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43175906.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 820341853 is about 28641.6105168686. The cubic root of 820341853 is about 936.1202137737.

The spelling of 820341853 in words is "eight hundred twenty million, three hundred forty-one thousand, eight hundred fifty-three".