820344019 has 8 divisors (see below), whose sum is σ = 942022080. Its totient is φ = 706516200.

The previous prime is 820343999. The next prime is 820344023. The reversal of 820344019 is 910443028.

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

It is a cyclic number.

It is not a de Polignac number, because 820344019 - 2²⁷ = 686126291 is a prime.

It is a super-2 number, since 2×820344019² = 1345928619018144722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820344089) 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, 1962337 + ... + 1962754.

It is an arithmetic number, because the mean of its divisors is an integer number (117752760).

Almost surely, 2^820344019 is an apocalyptic number.

820344019 is a deficient number, since it is larger than the sum of its proper divisors (121678061).

820344019 is a wasteful number, since it uses less digits than its factorization.

820344019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3925121.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 820344019 is about 28641.6483289632. The cubic root of 820344019 is about 936.1210376719.

Subtracting 820344019 from its reverse (910443028), we obtain a palindrome (90099009).

The spelling of 820344019 in words is "eight hundred twenty million, three hundred forty-four thousand, nineteen".