820665922 has 32 divisors (see below), whose sum is σ = 1366352064. Its totient is φ = 367987200.

The previous prime is 820665907. The next prime is 820665943. The reversal of 820665922 is 229566028.

It is a super-2 number, since 2×820665922² = 1346985111064220168, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53097 + ... + 66787.

It is an arithmetic number, because the mean of its divisors is an integer number (42698502).

Almost surely, 2^820665922 is an apocalyptic number.

820665922 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

820665922 is a deficient number, since it is larger than the sum of its proper divisors (545686142).

820665922 is a wasteful number, since it uses less digits than its factorization.

820665922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13794.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 820665922 is about 28647.2672693226. The cubic root of 820665922 is about 936.2434662940.

The spelling of 820665922 in words is "eight hundred twenty million, six hundred sixty-five thousand, nine hundred twenty-two".