820722 has 16 divisors (see below), whose sum is σ = 1876032. Its totient is φ = 234480.

The previous prime is 820711. The next prime is 820723. The reversal of 820722 is 227028.

820722 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nialpdrome in base 7.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 820722.

It is not an unprimeable number, because it can be changed into a prime (820723) by changing a digit.

820722 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9729 + ... + 9812.

It is an arithmetic number, because the mean of its divisors is an integer number (117252).

2⁸²⁰⁷²² is an apocalyptic number.

820722 is an abundant number, since it is smaller than the sum of its proper divisors (1055310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

820722 is a wasteful number, since it uses less digits than its factorization.

820722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19553.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 820722 is about 905.9370839081. The cubic root of 820722 is about 93.6264791035.

The spelling of 820722 in words is "eight hundred twenty thousand, seven hundred twenty-two".