820542 has 16 divisors (see below), whose sum is σ = 1653120. Its totient is φ = 271512.

The previous prime is 820541. The next prime is 820559. The reversal of 820542 is 245028.

820542 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 559 + ... + 1397.

It is an arithmetic number, because the mean of its divisors is an integer number (103320).

2⁸²⁰⁵⁴² is an apocalyptic number.

820542 is an abundant number, since it is smaller than the sum of its proper divisors (832578).

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

820542 is a wasteful number, since it uses less digits than its factorization.

820542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 820542 is about 905.8377338133. The cubic root of 820542 is about 93.6196339118.

The spelling of 820542 in words is "eight hundred twenty thousand, five hundred forty-two".