816020 has 12 divisors (see below), whose sum is σ = 1713684. Its totient is φ = 326400.

The previous prime is 816019. The next prime is 816037. The reversal of 816020 is 20618.

816020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 583696 + 232324 = 764^2 + 482^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 816020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20381 + ... + 20420.

It is an arithmetic number, because the mean of its divisors is an integer number (142807).

2⁸¹⁶⁰²⁰ is an apocalyptic number.

It is an amenable number.

816020 is an abundant number, since it is smaller than the sum of its proper divisors (897664).

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

816020 is a wasteful number, since it uses less digits than its factorization.

816020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40810 (or 40808 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 816020 is about 903.3382533691. The cubic root of 816020 is about 93.4473380133.

Subtracting from 816020 its sum of digits (17), we obtain a triangular number (816003 = T₁₂₇₇).

Adding to 816020 its reverse (20618), we get a palindrome (836638).

The spelling of 816020 in words is "eight hundred sixteen thousand, twenty".