820380218 has 16 divisors (see below), whose sum is σ = 1451733504. Its totient is φ = 340249680.

The previous prime is 820380181. The next prime is 820380229. The reversal of 820380218 is 812083028.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 944705 + ... + 945572.

It is an arithmetic number, because the mean of its divisors is an integer number (90733344).

Almost surely, 2^820380218 is an apocalyptic number.

820380218 is a deficient number, since it is larger than the sum of its proper divisors (631353286).

820380218 is a wasteful number, since it uses less digits than its factorization.

820380218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1890317.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 820380218 is about 28642.2802514046. The cubic root of 820380218 is about 936.1348067518.

The spelling of 820380218 in words is "eight hundred twenty million, three hundred eighty thousand, two hundred eighteen".