820426 has 8 divisors (see below), whose sum is σ = 1243620. Its totient is φ = 405888.

The previous prime is 820411. The next prime is 820427. The reversal of 820426 is 624028.

It can be written as a sum of positive squares in 2 ways, for example, as 731025 + 89401 = 855^2 + 299^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 820397 and 820406.

It is not an unprimeable number, because it can be changed into a prime (820427) 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, 1921 + ... + 2308.

2⁸²⁰⁴²⁶ is an apocalyptic number.

820426 is a deficient number, since it is larger than the sum of its proper divisors (423194).

820426 is a wasteful number, since it uses less digits than its factorization.

820426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4328.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 820426 is about 905.7737024224. The cubic root of 820426 is about 93.6152220355.

The spelling of 820426 in words is "eight hundred twenty thousand, four hundred twenty-six".