820363 has 4 divisors (see below), whose sum is σ = 863560. Its totient is φ = 777168.

The previous prime is 820361. The next prime is 820367. The reversal of 820363 is 363028.

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 820363 - 2¹ = 820361 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (820361) 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, 21570 + ... + 21607.

It is an arithmetic number, because the mean of its divisors is an integer number (215890).

2⁸²⁰³⁶³ is an apocalyptic number.

820363 is a deficient number, since it is larger than the sum of its proper divisors (43197).

820363 is a wasteful number, since it uses less digits than its factorization.

820363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43196.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 820363 is about 905.7389248564. The cubic root of 820363 is about 93.6128257560.

The spelling of 820363 in words is "eight hundred twenty thousand, three hundred sixty-three".