820427212 has 12 divisors (see below), whose sum is σ = 1566270216. Its totient is φ = 372921440.

The previous prime is 820427161. The next prime is 820427213. The reversal of 820427212 is 212724028.

It is not an unprimeable number, because it can be changed into a prime (820427213) 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, 9322993 + ... + 9323080.

It is an arithmetic number, because the mean of its divisors is an integer number (130522518).

Almost surely, 2^820427212 is an apocalyptic number.

It is an amenable number.

820427212 is a deficient number, since it is larger than the sum of its proper divisors (745843004).

820427212 is a wasteful number, since it uses less digits than its factorization.

820427212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18646088 (or 18646086 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 820427212 is about 28643.1006003191. The cubic root of 820427212 is about 936.1526813414.

The spelling of 820427212 in words is "eight hundred twenty million, four hundred twenty-seven thousand, two hundred twelve".