820816334 has 8 divisors (see below), whose sum is σ = 1325934120. Its totient is φ = 378838296.

The previous prime is 820816327. The next prime is 820816343. The reversal of 820816334 is 433618028.

It is a happy number.

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

It is a super-2 number, since 2×820816334² = 1347478908322399112, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 820816294 and 820816303.

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, 15784904 + ... + 15784955.

It is an arithmetic number, because the mean of its divisors is an integer number (165741765).

Almost surely, 2^820816334 is an apocalyptic number.

820816334 is a deficient number, since it is larger than the sum of its proper divisors (505117786).

820816334 is a wasteful number, since it uses less digits than its factorization.

820816334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31569874.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 820816334 is about 28649.8923907229. The cubic root of 820816334 is about 936.3006611671.

It can be divided in two parts, 8208 and 16334, that added together give a palindrome (24542).

The spelling of 820816334 in words is "eight hundred twenty million, eight hundred sixteen thousand, three hundred thirty-four".