820494 has 24 divisors (see below), whose sum is σ = 1803360. Its totient is φ = 269568.

The previous prime is 820489. The next prime is 820537. The reversal of 820494 is 494028.

It is a congruent number.

It is an unprimeable number.

820494 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 11 ways as a sum of consecutive naturals, for example, 1134 + ... + 1710.

It is an arithmetic number, because the mean of its divisors is an integer number (75140).

2⁸²⁰⁴⁹⁴ is an apocalyptic number.

820494 is an abundant number, since it is smaller than the sum of its proper divisors (982866).

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

820494 is a wasteful number, since it uses less digits than its factorization.

820494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664 (or 661 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 820494 is about 905.8112386143. The cubic root of 820494 is about 93.6178083582.

It can be divided in two parts, 8 and 20494, that added together give a palindrome (20502).

The spelling of 820494 in words is "eight hundred twenty thousand, four hundred ninety-four".