820687916 has 12 divisors (see below), whose sum is σ = 1438067232. Its totient is φ = 409811568.

The previous prime is 820687913. The next prime is 820687921. The reversal of 820687916 is 619786028.

It is not an unprimeable number, because it can be changed into a prime (820687913) 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, 129620 + ... + 135803.

It is an arithmetic number, because the mean of its divisors is an integer number (119838936).

Almost surely, 2^820687916 is an apocalyptic number.

It is an amenable number.

820687916 is a deficient number, since it is larger than the sum of its proper divisors (617379316).

820687916 is a wasteful number, since it uses less digits than its factorization.

820687916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266200 (or 266198 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 820687916 is about 28647.6511428075. The cubic root of 820687916 is about 936.2518300526.

The spelling of 820687916 in words is "eight hundred twenty million, six hundred eighty-seven thousand, nine hundred sixteen".