820805302 has 4 divisors (see below), whose sum is σ = 1231207956. Its totient is φ = 410402650.

The previous prime is 820805273. The next prime is 820805311. The reversal of 820805302 is 203508028.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×820805302² = 1347442687582622408, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205201324 + ... + 205201327.

It is an arithmetic number, because the mean of its divisors is an integer number (307801989).

Almost surely, 2^820805302 is an apocalyptic number.

820805302 is a deficient number, since it is larger than the sum of its proper divisors (410402654).

820805302 is a wasteful number, since it uses less digits than its factorization.

820805302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410402653.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 820805302 is about 28649.6998588118. The cubic root of 820805302 is about 936.2964664345.

The spelling of 820805302 in words is "eight hundred twenty million, eight hundred five thousand, three hundred two".